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      "permlink": "distributing-javafx-desktop-applications-without-requiring-a-jvm-using-jlink-and-jpackage",
      "title": "Distributing JavaFX desktop applications without requiring a JVM (using jlink and jpackage)",
      "body": "@@ -1198,24 +1198,25 @@\n t:%0A%0A*   JAVA\n-\n \n+%5C\n _HOME - shou\n@@ -1426,16 +1426,17 @@\n     JAVA\n+%5C\n _HOME=/u\n@@ -1478,24 +1478,25 @@\n 0-0.fc30.x86\n+%5C\n _64%0A%0AI've al\n@@ -1965,16 +1965,17 @@\n fc30.x86\n-\n \n+%5C\n _64%0A    \n@@ -3261,24 +3261,25 @@\n fBoxVersion \n+%5C\n = '2.0.17'%0A \n@@ -3313,16 +3313,17 @@\n Version \n+%5C\n = '1.64'\n@@ -3351,16 +3351,17 @@\n Version \n+%5C\n = '2.3.1\n@@ -3391,16 +3391,17 @@\n Version \n+%5C\n = '4.12'\n@@ -3428,24 +3428,25 @@\n kitoVersion \n+%5C\n = '3.1.0'%0A  \n@@ -3474,16 +3474,17 @@\n Version \n+%5C\n = '3.13.\n@@ -3906,32 +3906,33 @@\n etCompatibility \n+%5C\n = %2211%22%0A    sourc\n@@ -3946,16 +3946,17 @@\n ibility \n+%5C\n = %2211%22%0A \n@@ -3980,16 +3980,17 @@\n ildDate \n+%5C\n = new Da\n@@ -4014,16 +4014,17 @@\n version \n+%5C\n = %220.3%22%0A\n@@ -4523,16 +4523,17 @@\n version \n+%5C\n = %2211%22%0A \n@@ -4547,18 +4547,20 @@\n modules \n+%5C\n = \n+%5C\n %5B 'javaf\n@@ -4586,16 +4586,17 @@\n x.fxml' \n+%5C\n %5D%0A    %7D%0A\n@@ -4614,16 +4614,17 @@\n assName \n+%5C\n = %22pdfde\n@@ -4692,34 +4692,36 @@\n         jvmArgs \n+%5C\n = \n+%5C\n %5B'-Djdk.gtk.vers\n@@ -4718,32 +4718,33 @@\n k.gtk.version=2'\n+%5C\n %5D // required du\n@@ -4864,32 +4864,33 @@\n            name \n+%5C\n = 'PDF Decorator\n@@ -4903,34 +4903,36 @@\n         jvmArgs \n+%5C\n = \n+%5C\n %5B'-Djdk.gtk.vers\n@@ -4929,32 +4929,33 @@\n k.gtk.version=2'\n+%5C\n %5D // required du\n@@ -5704,21 +5704,23 @@\n st%0A%0A    \n+%5C\n --add\n+%5C\n -modules\n@@ -5746,37 +5746,39 @@\n core,junit%0A%0A    \n+%5C\n --add\n+%5C\n -reads%0A      pdf\n@@ -5786,16 +5786,17 @@\n ecorator\n+%5C\n =org.ass\n@@ -5816,21 +5816,23 @@\n it%0A%0A    \n+%5C\n --add\n+%5C\n -reads%0A \n@@ -5852,16 +5852,17 @@\n rtj.core\n+%5C\n =java.lo\n@@ -8311,30 +8311,32 @@\n iable BADASS\n+%5C\n _JLINK\n+%5C\n _JPACKAGE_HO\n@@ -8328,24 +8328,25 @@\n NK%5C_JPACKAGE\n+%5C\n _HOME pointi\n@@ -8427,22 +8427,24 @@\n   BADASS\n+%5C\n _JLINK\n+%5C\n _JPACKAG\n@@ -8444,16 +8444,17 @@\n JPACKAGE\n+%5C\n _HOME=/u\n@@ -11379,32 +11379,50 @@\n -installer.png%5D(\n+https://walczak.it\n /application/fil\n@@ -11589,24 +11589,42 @@\n s-menu.png%5D(\n+https://walczak.it\n /application\n@@ -11983,24 +11983,42 @@\n taller.png%5D(\n-\n \n+https://walczak.it\n /application\n@@ -12658,24 +12658,42 @@\n failed.png%5D(\n-\n \n+https://walczak.it\n /application\n@@ -13192,16 +13192,17 @@\n st be a \n+%5C\n *.direct\n@@ -13208,16 +13208,17 @@\n tory or \n+%5C\n *.deskto\n@@ -13487,16 +13487,34 @@\n ll.png%5D(\n-\n \n+https://walczak.it\n /applica\n@@ -14819,136 +14819,8 @@\n ved.\n-%0A%0A* * *%0A%0ASource: https://walczak.it/blog/distributing-javafx-desktop-applications-without-requiring-jvm-using-jlink-and-jpackage\n \n+\n %0A%0A* \n",
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      "author": "walczakit",
      "permlink": "distributing-javafx-desktop-applications-without-requiring-a-jvm-using-jlink-and-jpackage",
      "title": "Distributing JavaFX desktop applications without requiring a JVM (using jlink and jpackage)",
      "body": "@@ -1198,25 +1198,24 @@\n t:%0A%0A*   JAVA\n-%5C\n \n+\n _HOME - shou\n@@ -1425,17 +1425,16 @@\n     JAVA\n-%5C\n _HOME=/u\n@@ -1476,25 +1476,24 @@\n 0-0.fc30.x86\n-%5C\n _64%0A%0AI've al\n@@ -1962,17 +1962,16 @@\n fc30.x86\n-%5C\n \n+\n _64%0A    \n@@ -3257,25 +3257,24 @@\n fBoxVersion \n-%5C\n = '2.0.17'%0A \n@@ -3308,17 +3308,16 @@\n Version \n-%5C\n = '1.64'\n@@ -3345,17 +3345,16 @@\n Version \n-%5C\n = '2.3.1\n@@ -3384,17 +3384,16 @@\n Version \n-%5C\n = '4.12'\n@@ -3420,25 +3420,24 @@\n kitoVersion \n-%5C\n = '3.1.0'%0A  \n@@ -3465,17 +3465,16 @@\n Version \n-%5C\n = '3.13.\n@@ -3896,33 +3896,32 @@\n etCompatibility \n-%5C\n = %2211%22%0A    sourc\n@@ -3935,17 +3935,16 @@\n ibility \n-%5C\n = %2211%22%0A \n@@ -3968,17 +3968,16 @@\n ildDate \n-%5C\n = new Da\n@@ -4001,17 +4001,16 @@\n version \n-%5C\n = %220.3%22%0A\n@@ -4509,17 +4509,16 @@\n version \n-%5C\n = %2211%22%0A \n@@ -4532,20 +4532,18 @@\n modules \n-%5C\n = \n-%5C\n %5B 'javaf\n@@ -4569,17 +4569,16 @@\n x.fxml' \n-%5C\n %5D%0A    %7D%0A\n@@ -4596,17 +4596,16 @@\n assName \n-%5C\n = %22pdfde\n@@ -4673,36 +4673,34 @@\n         jvmArgs \n-%5C\n = \n-%5C\n %5B'-Djdk.gtk.vers\n@@ -4697,33 +4697,32 @@\n k.gtk.version=2'\n-%5C\n %5D // required du\n@@ -4850,17 +4850,16 @@\n    name \n-%5C\n = 'PDF D\n@@ -4892,12 +4892,10 @@\n rgs \n-%5C\n = \n-%5C\n %5B'-D\n@@ -4912,17 +4912,16 @@\n rsion=2'\n-%5C\n %5D // req\n@@ -5678,23 +5678,21 @@\n st%0A%0A    \n-%5C\n --add\n-%5C\n -modules\n@@ -5718,39 +5718,37 @@\n core,junit%0A%0A    \n-%5C\n --add\n-%5C\n -reads%0A      pdf\n@@ -5756,17 +5756,16 @@\n ecorator\n-%5C\n =org.ass\n@@ -5789,15 +5789,13 @@\n     \n-%5C\n --add\n-%5C\n -rea\n@@ -5819,17 +5819,16 @@\n rtj.core\n-%5C\n =java.lo\n@@ -8277,32 +8277,30 @@\n iable BADASS\n-%5C\n _JLINK\n-%5C\n _JPACKAGE%5C_H\n@@ -8292,25 +8292,24 @@\n INK_JPACKAGE\n-%5C\n _HOME pointi\n@@ -8394,16 +8394,14 @@\n DASS\n-%5C\n _JLINK\n-%5C\n _JPA\n@@ -8405,17 +8405,16 @@\n JPACKAGE\n-%5C\n _HOME=/u\n@@ -13080,17 +13080,16 @@\n st be a \n-%5C\n *.direct\n@@ -13099,9 +13099,8 @@\n  or \n-%5C\n *.de\n@@ -14683,16 +14683,144 @@\n esolved.\n-\n \n+%0A%0A* * *%0A%0ASource: https://walczak.it/blog/distributing-javafx-desktop-applications-without-requiring-jvm-using-jlink-and-jpackage\n %0A%0A* * *%0A\n",
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      "parent_permlink": "java",
      "author": "walczakit",
      "permlink": "distributing-javafx-desktop-applications-without-requiring-a-jvm-using-jlink-and-jpackage",
      "title": "Distributing JavaFX desktop applications without requiring a JVM (using jlink and jpackage)",
      "body": "The times when Java was available on almost every desktop are long gone but you can still distribute your desktop applications written in Java in a user friendly way. Since the release of OpenJDK and OpenJFX 9 we can benefit from the JVMs modularization efforts and easily build executables with a bundled JVM trimmed to the needs of our application. In this article we will show you how we ported our small desktop app called PDF Decorator to OpenJDK 11 and used tools like jlink and jpackage to start distributing our app without requiring any third party software on our clients machines.\n\n![openjdk.jpg](https://walczak.it/application/files/5915/7245/6751/openjdk.jpg)\n\nInstall OpenJDK 11\n------------------\n\nFirst of all we must set up our development environment and make sure that we have OpenJDK 11 installed. The best place to get any version of OpenJDK is the [AdoptOpenJDK](https://adoptopenjdk.net) project. Select the OpenJDK 11 with the HotSpot JVM and download the latest release.\n\n[![adopt-open-jdk.png](https://walczak.it/application/files/5015/7165/3720/adopt-open-jdk.png)](https://adoptopenjdk.net)\n\nAfter installing make sure you have the following system variables poperly set:\n\n*   JAVA\\_HOME - should be pointing to the directory containing the extracted JDK,\n*   PATH - should contain the path to the extracted JDKs subdirectory called bin.\n\nOn my Fedora Linux machine I have exported the variable:\n\n    JAVA\\_HOME=/usr/lib/jvm/java-11-openjdk-11.0.5.10-0.fc30.x86\\_64\n\nI've also used this command to make sure the right version of the JDK is prioritized in the PATH variable:\n\n    sudo alternatives --config java\n\nIf you have done the configuration correctly (be it on Windows, Mac or Linux) then you should see the desired Java version and java.home path after typing this in your command line:\n\n    java -XshowSettings:properties -version\n\n    Property settings:\n        ...\n        java.home = /usr/lib/jvm/java-11-openjdk-11.0.5.10-0.fc30.x86\\_64\n        ...\n\n    openjdk version \"11.0.5\" 2019-10-15\n    OpenJDK Runtime Environment 18.9 (build 11.0.5+10)\n    OpenJDK 64-Bit Server VM 18.9 (build 11.0.5+10, mixed mode, sharing)\n\nPorting to modular Java 11 and jlink\n------------------------------------\n\n[PDF Decorator](http://pdf-decorator.walczak.it/) is a small desktop app we developed way back in 2015 for the [WALCZAK - wooden floors](http://walczakfloors.com) company to help them adjust their PDF documents to their new visual cooperate identity. We build it using OracleJDK 8 with Gradle and distributed it as a fat jar expecting that the desktops that will run it will have Oracle JVM installed. Today this assumption seams archaic and as [PDF Decorator](http://pdf-decorator.walczak.it/) attracted a small user base after being open sourced, we decided to build it using OpenJDK 11 and jlink to change the way we package our app. To accomplish this we had to:\n\n*   upgrade our dependancies to use modularized libraries where possible\n*   change our build process in build.gradle\n*   modularize our app by adding a module-info.java and module-info.test\n\nOur build script required some changes to work with jlink and this is how it looks like now:\n\n### build.gradle\n\n    buildscript {\n            ext {\n                pdfBoxVersion \\= '2.0.17'\n                bouncycastleVersion \\= '1.64'\n                jaxbVersion \\= '2.3.1'\n                junitVersion \\= '4.12'\n                mockitoVersion \\= '3.1.0'\n                assertjVersion \\= '3.13.2'\n            }\n            repositories {\n            mavenCentral()\n            jcenter()\n        }\n\n    }\n\n    plugins {\n        id 'java'\n        id 'org.javamodularity.moduleplugin' version \"1.5.0\"\n        id 'application'\n        id 'org.openjfx.javafxplugin' version '0.0.8'\n        id 'org.beryx.jlink' version '2.16.2'\n    }\n\n    repositories {\n        mavenCentral()\n        jcenter()\n    }\n    \n    targetCompatibility \\= \"11\"\n    sourceCompatibility \\= \"11\"\n    project.ext.buildDate \\= new Date()\n    project.version \\= \"0.3\"\n\n    dependencies {\n        compile(\"javax.xml.bind:jaxb-api:${jaxbVersion}\")\n        compile(\"org.glassfish.jaxb:jaxb-runtime:${jaxbVersion}\")\n        compile(\"org.apache.pdfbox:pdfbox:${pdfBoxVersion}\")\n        compile(\"org.bouncycastle:bcprov-jdk15to18:${bouncycastleVersion}\")\n        testCompile(\"junit:junit:${junitVersion}\")\n        testCompile(\"org.mockito:mockito-core:${mockitoVersion}\")\n        testCompile(\"org.assertj:assertj-core:${assertjVersion}\")\n    }\n\n    javafx {\n        version \\= \"11\"\n        modules \\= \\[ 'javafx.controls', 'javafx.fxml' \\]\n    }\n\n    mainClassName \\= \"pdfdecorator/pdfdecorator.gui.PdfDecoratorApplication\"\n\n    run {\n        jvmArgs \\= \\['-Djdk.gtk.version=2'\\] // required due to a bug in Java: https://github.com/javafxports/openjdk-jfx/issues/175\n    }\n\n    jlink {\n        launcher {\n            name \\= 'PDF Decorator'\n            jvmArgs \\= \\['-Djdk.gtk.version=2'\\] // required due to a bug in Java: https://github.com/javafxports/openjdk-jfx/issues/175\n        }\n    }\n\n\nTo make the app build and run in a modular way we also had to add the following module descriptor:\n\n### src/main/java/module-info.java\n\n    module pdfdecorator {\n        requires java.xml.bind;\n        requires com.sun.xml.bind;\n        requires java.desktop;\n        requires java.logging;\n        requires javafx.controls;\n        requires javafx.fxml;\n        requires org.apache.pdfbox;\n        opens pdfdecorator.model to java.xml.bind;\n        opens pdfdecorator.gui to javafx.graphics, javafx.fxml;\n    }\n\nTo make our tests work we also had to add some command line options for java in a special type of file:\n\n### src/test/java/module-info.test\n\n    \\--add\\-modules\n      org.assertj.core,junit\n\n    \\--add\\-reads\n      pdfdecorator\\=org.assertj.core,junit\n\n    \\--add\\-reads\n      org.assertj.core\\=java.logging\n\n\nFor a full list of changes made to our project please see [this commit](https://bitbucket.org/walczak_it/pdf-decorator/commits/b5d81e303994e969f7db7e282813e090d77d16d9). After doing all this we build the project, executed our unit tests and runned our applications from gradle.\n\n    ./gradlew clean build test run\n\nWe also did some manual clicking to make sure that our applications GUI works as expected.\n\nNow its time to build an image of our application with a bundled custom trimmed JVM using jlink. To do so we will execute the following gradle command:\n\n    ./gradlew jlink\n\nthis uses the [Badass JLink](https://github.com/beryx/badass-jlink-plugin) gradle plugin and after some minutes we can see that a new directory appeared in our project: build/image\n\nIf we run the executable file build/image/bin/PDF Decorator then our application will show up and it will not be using the JVM installed on our system. It will use its own JVM contained in the build/image directory.\n\n![build-image-dir.png](https://walczak.it/application/files/8015/7174/3229/build-image-dir.png)   ![pdf-decorator.png](https://walczak.it/application/files/7515/7229/2624/pdf-decorator.png)\n\nFrom this point we could just:\n\n*   run the jlink task on every OS we support,\n*   remane the image directory do pdf-decroator,\n*   zip it to pdf-decroator-win.zip or pdf-decroator-linux.zip, etc.\n*   distribute thoose archives to our users.\n\nJava won't be required on their machines to run it but extracting an archive and finding an executable in it to run is not the most user friendly experience. Providing an installer / package would be much easier for every one. Because of this lets take a look at an upcoming tool developed for Java 14: jpackage. \n\nBuilding an installer using jpackage\n------------------------------------\n\nAt the time we are writing this article jpackage is still in development and targets JDK 14. It would be tempting to build our entire app using the upcoming JDK 14 however Gradle will not run on it because of a [bug in Groovy](https://issues.apache.org/jira/browse/GROOVY-9211). Fortunately our [Badass JLink](https://github.com/beryx/badass-jlink-plugin) gralde plugin can be configured to use jpackage from JDK 14 even if our project is build using OpenJDK 11. To do this lets download the [early access JDK14 with jpackage](https://jdk.java.net/jpackage/), extract the archive to a desired location and add an environmental variable BADASS\\_JLINK\\_JPACKAGE\\_HOME pointing to that location. On my Fedora Linux this variable looks like this:\n\n    BADASS\\_JLINK\\_JPACKAGE\\_HOME=/usr/lib/jvm/jdk-14\n\nNow to build the installer we will enhance our build script so that our app has proper icons and additional information about it self:\n\n### jlink task from build.gradle\n\n    jlink {\n        options = ['--strip-debug', '--compress', '2', '--no-header-files', '--no-man-pages']\n        launcher {\n            name = 'PDF Decorator'\n            jvmArgs = ['-Djdk.gtk.version=2'] // required due to a bug in Java: https://github.com/javafxports/openjdk-jfx/issues/175\n        }\n        jpackage {\n            installerOptions = [\n                '--description', project.description,\n                '--copyright', 'Copyrigth 2015-2019 WALCZAK.IT'\n            ]\n            installerType = project.findProperty('installerType') // we will pass this from the command line (example: -PinstallerType=msi)\n            if (installerType == 'msi') {\n                imageOptions += ['--icon', 'src/main/resources/pdfdecorator/gui/icon.ico']\n                installerOptions += [\n                    '--win-per-user-install', '--win-dir-chooser',\n                    '--win-menu', '--win-shortcut'\n                ]\n            }\n            if (installerType == 'pkg') {\n                imageOptions += ['--icon', 'src/main/resources/pdfdecorator/gui/icon.icns']\n            }\n            if (installerType in ['deb', 'rpm']) {\n                imageOptions += ['--icon', 'src/main/resources/pdfdecorator/gui/icon_256x256.png']\n                installerOptions += [\n                    '--linux-menu-group', 'Office',\n                    '--linux-shortcut'\n                ]\n            }\n            if (installerType == 'deb') {\n                installerOptions += [\n                    '--linux-deb-maintainer', '[email protected]'\n                ]\n            }\n            if (installerType == 'rpm') {\n                installerOptions += [\n                    '--linux-rpm-license-type', 'GPLv3'\n                ]\n            }\n        }\n    }\n\n    jpackage {\n        doFirst {\n            project.getProperty('installerType') // throws exception if its missing\n        }\n    }\n\nTo build an installer for a given operation system we have to be on that system, have the necessary tooling installed and type the following command:\n\n    ./gradlew jpackage -PinstallerType=...\n\nOf course the type of installer will depend on the operating system we are building for / on.\n\n### on Microsoft Windows\n\nBefore we start building on Windows we must [enable .NET Frakemwork 3.5](https://docs.microsoft.com/en-us/dotnet/framework/install/dotnet-35-windows-10?redirectedfrom=MSDN#ControlPanel) and install [WIX toolset](https://wixtoolset.org/). After that we just type in our projects directory:\n\n    gradlew.bat jpackage -PinstallerType=msi\n\nand after a successful build we should see a MSI package in our build/jpackage directory. Double clicking on it will start the installation wizard.\n\n![pdf-decorator-windows-installer.png](/application/files/thumbnails/small/5715/7227/8774/pdf-decorator-windows-installer.png)\n\nAfter completing we can find our application in the start menu.\n\n![pdf-decorator-windows-menu.png](/application/files/thumbnails/small/7415/7237/6787/pdf-decorator-windows-menu.png)\n\n### on Mac OS\n\nWe just type the following in our projects directory:\n\n    ./gradlew jpackage -PinstallerType=pkg\n\nThis will result in a PKG package appearing in our build/jpackage directory. Double clicking on it will start the installation wizard.\n\n### ![pdf-decorator-mac-os-installer.png](/application/files/thumbnails/small/4715/7324/3612/pdf-decorator-mac-os-installer.png)\n\nAfter completing we can find our application in the lunchpad.\n\n![pdf-decorator-mac-os-lunchpad.png](https://walczak.it/application/files/3015/7324/3619/pdf-decorator-mac-os-lunchpad.png)\n\n### on Fedora and other RPM based Linux distros\n\nBefore we start building we must have rpm-build package installed. We can do this by typing:\n\n    sudo dnf install rpm-build\n\nAfter that we just type in our projects directory:\n\n    ./gradlew jpackage -PinstallerType=rpm\n\nThis will result in a RPM package appearing in our build/jpackage directory.\n\n![pdf-decorator-rpm-failed.png](/application/files/thumbnails/small/3915/7229/3589/pdf-decorator-rpm-failed.png)\n\nUnfortunately, at the time we are writing this article jpackage struggles to build a working RPM and double clicking on it will cause an error to show in the package manager on Fedora 30. Even after ignoring this error and installing  we could not find any way to activate our application in Gnome Shell. I was also not able to uninstall this package due to the following error:\n\n    xdg-desktop-menu: file to uninstall must be a \\*.directory or \\*.desktop file\n\n### On Ubuntu and other DEB based Linux distros\n\nWe just type the following in our projects directory:\n\n    ./gradlew jpackage -PinstallerType=deb\n\nThis will result in a DEB package appearing in our build/jpackage directory.\n\n![pdf-decorator-ubuntu-install.png](/application/files/thumbnails/small/9215/7237/6246/pdf-decorator-ubuntu-install.png)\n\nUnfortunately, DEB packages are also not working correctly. After installing the package we could not find any way to activate our application in Gnome Shell. I was also not able to uninstall it due to the same error we noticed on Fedora.\n\nConclusion\n----------\n\nJava is still a good platform for building desktop apps and may sometimes suite your requirements better then browser based technologies that are trending today. Modularization and jlink allows us to ship apps without requiring users to install Java and with the upcoming jpackage tool we will also gain an easy way to build user friendly installers / packages. If you want to examine an application that uses jlink and jpackage in more detail the dive into our [PDF Decorators source code](https://bitbucket.org/walczak_it/pdf-decorator/src/master/).\n\nThere is still some work in jpackage that needs to be done to consider it production ready for enterprise apps. We reported the problems we've encountered ([JDK-8233449](https://bugs.java.com/bugdatabase/view_bug.do?bug_id=JDK-8233449)) and as you can see from the comment section below the authors of this tool are collaborating with us to fix them. We'll update this article when those issues get resolved.\n\n* * *\n\n[![](https://walczak.it/application/files/1514/9288/8199/walczak-it-logo5.png)](https://walczak.it/contact)\n\nDo you need help in your company with some topic we mentioned in our blog articles? If so, then please feel free to [contact us](https://walczak.it/contact). We can help you by providing [consulting and audit](https://walczak.it/consulting-and-audits) services or by organizing [training workshops](https://walczak.it/training-courses) for your employees. We can also aid you in [software development](https://walczak.it/software-development) by outsourcing our developers.",
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      "author": "steemitboard",
      "permlink": "steemitboard-notify-walczakit-20190809t214917000z",
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      "body": "Congratulations @walczakit! You received a personal award!\n\n<table><tr><td>https://steemitimages.com/70x70/http://steemitboard.com/@walczakit/birthday2.png</td><td>Happy Birthday! - You are on the Steem blockchain for 2 years!</td></tr></table>\n\n<sub>_You can view [your badges on your Steem Board](https://steemitboard.com/@walczakit) and compare to others on the [Steem Ranking](https://steemitboard.com/ranking/index.php?name=walczakit)_</sub>\n\n\n###### [Vote for @Steemitboard as a witness](https://v2.steemconnect.com/sign/account-witness-vote?witness=steemitboard&approve=1) to get one more award and increased upvotes!",
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      "title": "Spring Data JPA - data projection in dynamic queries",
      "body": "**Problem:** we want queries to our entities to eagerly fetch only the fields that we need in the given context (for example to show in a specific UI data table).  \n\n**Requirement:** our solution must be able to accept dynamic filter compositions.  \n\n**Possible solutions:**\n\n* Named Entity Graphs from the JPA standard\n* Projections mechanism from Spring Data\n\nLets research them!\n\n<center>![spring-data.png][1]</center>\n\n## JPA Named Entity Graphs\n\nThis mechanism comes directly from the JPA specifications and is supported by Spring Data repositories. To use it we must first specify a graph on our entity. In that graph we define the fields to be eagerly fetched.\n\n### Entity with an example graph definition\n    \n    \n    @NamedEntityGraph(\n        name=\"Person.justName\",\n        attributeNodes={\n            @NamedAttributeNode(\"firstName\"),\n            @NamedAttributeNode(\"lastName\")\n        }\n    )\n    @Entity\n    public class Person {\n     \n        private UUID id;\n        private String firstName;\n        private String lastName;\n        private String countryCode;\n        \n        // setters and getters\n    }\n\n### Spring Data repository which uses the example entity graph\n    \n    \n    public interface PersonRepository extends JpaRepository {\n     \n        @EntityGraph(value = \"Person.justName\", type = EntityGraphType.FETCH)\n        List findByCountryCode(String countryCode);\n    }\n\n\nAs you can see using entity graphs is trivial in this simple example. However, there is a crucial problem for more complex data models if you choose **Hibernate** as your JPA implementation. There is a [bug ][2] hanging around since 2014 which makes using named entity graphs impossible in @Embedded and @MappedSuperclass classes. If you're using another implementation that does not suffer from this limitation then you can read more about entity graphs in the [Java EE documentation][3] and the [Springs Data documentation][4].\n\n## Spring Data Projections\n\nThis is a feature from outside of the JPA specs and is supported only by Spring Data repositories for JPA. It uses interfaces to define the scope of data which you want to be fetched eagerly.\n\n### Our entity\n    \n    \n    @Entity\n    public class Person {\n     \n        private UUID id;\n        private String firstName;\n        private String lastName;\n        private String countryCode;\n        \n        // setters and getters\n    }\n\n### Interface which defines an example projections\n    \n    \n    public interface PersonNameOnly {\n     \n      String getFirstName();\n      String getLastName();\n    }\n\n### Spring Data repository which uses the example projection\n    \n    \n    public interface PersonRepository extends JpaRepository {\n     \n        List findByCountryCode(String countryCode);\n    }\n\nAs you can see this solutions returns only an interfaces with the projected fields and not an entity in which you could choose to get other properties using lazy fetching. This can be seen as a downside but in fact its a safer approach if performance is crucial to your app. Spring Data projections also have some interesting additional features that named entity graphs cannot provide. Your can read more about them in the [Spring Data JPA Reference Manual][5].\n\n## Usage in dynamic queries\n\nBoth mechanisms described in this article require some effort to make them work with dynamic queries constructed by the [Specifications mechanism from Spring Data][6]. Normaly we add the specifications mechanism to our repositories by extending the JpaSpecificationExecutor interface which gives a closed set of methods that accept Specification as their argument (optionally with the Pageable and Sort argument). Out of the box Spring Data JPA conventions do not let us to use Specification in our own methods. Because of this we cannot add our own dynamic query methods which would return a projection interface or have an @EntityGraph annotation. To solve this problem we must extend the internals of Spring Data - fortunately there are working third party libraries that do just that.\n\nFor Named Entity Graphs you have the [spring-data-jpa-entity-graph][7] library. However keep in mind that in the case of Hibernate it still will not solve the [bug][2] we mentioned earlier.\n\n### Maven dependancy\n    \n    \n    \n        com.cosium.spring.data\n        spring-data-jpa-entity-graph\n        ${springDataEntityGraphVersion}\n    \n\n### Configuration\n    \n    \n    @Configuration\n    @EnableJpaRepositories(repositoryFactoryBeanClass = EntityGraphJpaRepositoryFactoryBean.class)\n    public class DataRepositoryConfiguration {\n        //...\n    }\n\n### Repository\n    \n    \n    public interface PersonRepository\n        extends JpaRepository, EntityGraphJpaSpecificationExecutor { }\n\n### Usage\n    \n    \n    Page filteredPeople = personRepository.findAll(\n        filterSpecifications, pageRequest,\n        new EntityGraph(\"Person.justName\")\n    );\n\n \n\nFor Spring Data Projections there is a small library called [specification-with-projection][8]. There is also a [feature request][9] since 2016 to add this to the main library.\n\n### Maven dependancy\n    \n    \n    \n        th.co.geniustree.springdata.jpa\n        specification-with-projections\n        ${springDataSpecificationWithProjectionsVersion}\n    \n\n### Configuration\n    \n    \n    @Configuration\n    @EnableJpaRepositories(repositoryFactoryBeanClass = JpaSpecificationExecutorWithProjectionImpl.class)\n    public class DataRepositoryConfiguration {\n        //...\n    }\n\n### Repository\n    \n    \n    public interface PersonRepository\n        extends JpaRepository, JpaSpecificationExecutorWithProjection { }\n\n### Usage\n    \n    \n    Page filteredPeople = personRepository.findAll(\n        filterSpecifications,\n        PersonNameOnly.class\n        pageRequest\n    );\n\n\n***\n\nSource: https://walczak.it/blog/spring-data-jpa-projection-dynamic-queries\n\n* * *\n\n![][10]\n\nThis article is a result of our cooperation with [**Nextbuy** ][11]\\- a SaaS company which develops a procurement and online auction platform to connect buyers and suppliers. We provide various consulting and software development services to them and they have kindly allowed us to publish part of the resulting research / design documents. You can checkout their amazing platform at [www.nextbuy24.com][11]\n\n[1]: https://walczak.it/application/files/thumbnails/small/5615/5947/5300/spring-data.png\n[2]: https://hibernate.atlassian.net/browse/HHH-9298\n[3]: https://javaee.github.io/tutorial/persistence-entitygraphs003.html\n[4]: https://docs.spring.io/spring-data/jpa/docs/current/reference/html/#jpa.entity-graph\n[5]: https://docs.spring.io/spring-data/jpa/docs/current/reference/html/#projections\n[6]: https://docs.spring.io/spring-data/jpa/docs/current/reference/html/#specifications\n[7]: https://github.com/Cosium/spring-data-jpa-entity-graph\n[8]: https://github.com/pramoth/specification-with-projection\n[9]: https://jira.spring.io/browse/DATAJPA-1033\n[10]: https://walczak.it/application/files/thumbnails/small/5215/6115/1208/nextbuy_logo.png\n[11]: https://www.nextbuy24.com/",
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      "body": "Przeanalizowałem whitepaper i źródła mocno promowanego ostatnio FuturoCoina - wnioski w artykule\nhttp://walczak.it/pl/blog/futurocoin-kopia-dash-bez-decentralizacji",
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      "permlink": "futurocoin-a-copy-of-dash-without-the-decentralization",
      "title": "FuturoCoin - a copy of Dash without the decentralization",
      "body": "In the past months we could hear many controversies surrounding an upcoming coin developed by FutureNet called [FuturoCoin](https://futurocoin.com/). FutureNet is a social network and Multi Level Marketing (MLM) platform. Most of the cryto-community didn't take them seriously and ware expecting another [DasCoin](https://bitcointalk.org/index.php?topic=1636850.0) - a coin which had little do to with the term 'cryptocurrency' but was heavily marketed as such using MLM. Both FutureNet and the creators of DasCoin (Netleaders) are under [investigation by the Polish government](https://uokik.gov.pl/aktualnosci.php?news_id=13844) under the suspicion of being a ponzi-scheme. The fact that FutureNet promoted their FuturoCoin without even publishing a whitepaper also didn't help. Now that they finally have one and also published their source code we can see what this coin really is.\n\nhttp://walczak.it/application/files/thumbnails/large/1315/1822/0532/futurocoin-dash.jpg\n\n## They just copied Dash... \n\nAs it is confirmed in [their whitepaper](https://futurocoin.com/download/FuturoCoin-white-paper-en-31.01.18.pdf) ​​they just forked the source code from Dash, did some changes and initialized a new blockchain with it. Bare in mind that only a source code fork happened here - they didn't do a blockchain fork like Bitcoin Cash did with Bitcoin. Before we examin what changes they made lets see how Dash it self works.\n\nDash is a cryptocurrency that is build from a two layer protocol:\n\n* on the first layer its like Bitcoin - just a blockchain with blocks mined my miners using Proof of Work,\n* the second layer is build by a network of masternodes - thousands of servers which:\n  * provide the Instant Send functionality by locking your coins in one second and instructing the miners on how to build the next block to eliminate the possibility of double spending before your transaction receives its first confirmation,\n  * provide the Private Send functionality which mixes coins to make them less traceable,\n  * vote on which developer initiatives to fund from their treasury system - this makes Dash a decentralized organization.\n\n## How Dash works\n\nhttp://walczak.it/application/files/thumbnails/large/7215/1886/1144/dash-netword.png\n\nNo part of Dash is owned by a single company. Masternodes have tremendous power over the system as they guide the miners on how the blockchain should be constructed. This is actually how Instant Send gets done - those guidelines prohibit any transactions that could double spend coins locked for another Instant Send transaction. There are no limitations on who can run a masternode - the only barrier of entry is acquiring 1000 units of Dash needed to run one. This is no small investment but it didn't stop companies and idividuals to add over 4000 masternodes to the network.\n\n## ... and centralized it\n\nThe changes made in FuturoCoin seem subtle at first. Besides initializing a new blockchain you can read that they removed the Private Send feature for legal reasons. Everything in their whitepaper seems ok until you get to the jaw dropping statement at page 14:\n\n> Masternodes are owned by FutureNet company which is responsible for code development, organizing events, hiring employees, preparing and introducing marketing strategies and reward systems.\n\nSo much for decentralization there - a crucial part of the protocol is locked up in a single company. Furthermore all transactions have to be guided by those centralized masternodes because as we can read on page 12 - all of them are Instant Send transactions in FuturoCoin:\n\n> In DASH masternodes receive an additional fee for processing instant transactions. In FuturoCoin no additional fee is required for this kind of operation as all transactions are instant.\n\nIn consequence the fact that everyone can mine the coin is irrelevant - masternodes (a.k.a FutureNet) have too much control over how new blocks get created.\n\n## How FuturoCoin works\n\nhttp://walczak.it/application/files/thumbnails/large/8215/1886/1334/futurocoin-network_1.png\n\n## Conclusion\n\nIn our opinion you cannot call any system decentralized if one of its crucial components is fully controlled by one company. And if FuturoCoin isn't fully decetralized - you can argue it does not fully meet the definition of a cryptocurrency.\n\nWe asked FutureNet if the above statements from their whitepaper are just mistakes and could we run our own masternode. They replied that they are not, we can't, and afterwards argued that FutureCoin is still decentralized because anyone can mine it and that the masternodes do not interfere with the mining process - they just add the Instant Send feature. We replayed that the Instant Send feature IS implemented by interfering in the mining process so this answer makes no sense. The conversation ended with a remark that they are waiting for their technical expect to address our concerns. For many days we asked for an update on the topic but they just stopped replaying to our messages at all test.\n\nSource: [WALCZAK.IT Blog](http://walczak.it/blog/futurocoin-copy-dash-without-decentralization)",
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      "author": "colddays",
      "permlink": "re-walczakit-re-colddays-re-walczakit-need-1-burst-coin-please-come-here-20171230t152249241z",
      "title": "",
      "body": "Thanks, I restored now the burst coins to you, send 4 Burst to your wallet.",
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      "parent_author": "walczakit",
      "parent_permlink": "why-you-should-not-get-into-cryptocurrency-mining",
      "author": "franco-the-cat",
      "permlink": "re-walczakit-why-you-should-not-get-into-cryptocurrency-mining-20171204t162456412z",
      "title": "",
      "body": "@@ -358,16 +358,545 @@\n table.%0A%0A\n+There are a few tactics though that will improve your return;%0Aif a coin goes up in value fast 25%25 plus in a day then mining and exchange the coin for a top 20 coin will give you a good return. Currently ETC is a good example of this.%0Aif a coin corrects(top 50 coins only) its a good time to buy and hold for 3 to 6 months at least.%0AIf you are seeing a big rise in difficulty then its a good time to buy.%0AAlso beware of pump and dumper! normally they will be talking up a coin but will except donations in the top 4 coins only. %0A%0A\n Well hin\n",
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      "parent_permlink": "why-you-should-not-get-into-cryptocurrency-mining",
      "author": "franco-the-cat",
      "permlink": "re-walczakit-why-you-should-not-get-into-cryptocurrency-mining-20171204t162456412z",
      "title": "",
      "body": "I wish I read your article first.\nI started off with a few cloud mining contracts.\nThan went on to mine a single gpu,  cpu\nthen built a rig.\nand finally just brought direct from an exchange.\nWhile I cannt say Im making a loss .  If did this in the reverse order i would have made more money or  if I just exchanged in the begining i would be even more profitable.\n\nWell hindsight is a b****h!",
      "json_metadata": "{\"tags\":[\"mining\"],\"app\":\"steemit/0.1\"}"
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}

{
  "trx_id": "8177eee5e2df6bf698afdc67aac164bcf733bd3e",
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      "parent_author": "colddays",
      "parent_permlink": "re-walczakit-need-1-burst-coin-please-come-here-20171203t090735996z",
      "author": "walczakit",
      "permlink": "re-colddays-re-walczakit-need-1-burst-coin-please-come-here-20171204t121155135z",
      "title": "",
      "body": "here you go: https://explore.burst.cryptoguru.org/transaction/1111752080037132673",
      "json_metadata": "{\"tags\":[\"burst\"],\"links\":[\"https://explore.burst.cryptoguru.org/transaction/1111752080037132673\"],\"app\":\"steemit/0.1\"}"
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      "parent_permlink": "need-1-burst-coin-please-come-here",
      "author": "colddays",
      "permlink": "re-walczakit-need-1-burst-coin-please-come-here-20171203t090735996z",
      "title": "",
      "body": "Good stuff...thanks in advance: BURST-SUKB-3YAV-JX4H-CZEGE",
      "json_metadata": "{\"tags\":[\"burst\"],\"app\":\"steemit/0.1\"}"
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  "op": [
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      "author": "walczakit",
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      "author": "lukmarcus",
      "permlink": "re-walczakit-wprowadzenie-do-inwestowania-w-kryptowaluty-szkolenie-20171117t213452370z",
      "title": "",
      "body": "Hmm... nie lubię takich perfidnych reklam.",
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      "parent_permlink": "polish",
      "author": "walczakit",
      "permlink": "wprowadzenie-do-inwestowania-w-kryptowaluty-szkolenie",
      "title": "Wprowadzenie do inwestowania w kryptowaluty - szkolenie",
      "body": "@@ -150,16 +150,95 @@\n nia.pl%0A%0A\n+http://walczak.it/application/files/7615/1083/6942/warsztaty-kryptowaluty.jpg%0A%0A\n W przeci\n",
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  "op": [
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      "author": "walczakit",
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      "author": "cheetah",
      "permlink": "cheetah-re-walczakitwprowadzenie-do-inwestowania-w-kryptowaluty-szkolenie",
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      "body": "Hi! I am a robot. I just upvoted you! I found similar content that readers might be interested in:\nhttp://walczak.it/pl/szkolenia",
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      "parent_permlink": "polish",
      "author": "walczakit",
      "permlink": "wprowadzenie-do-inwestowania-w-kryptowaluty-szkolenie",
      "title": "Wprowadzenie do inwestowania w kryptowaluty - szkolenie",
      "body": "Warsztaty prowadzone przez tradera handlującego na 7 największych giełdach kryptowalut, konstruktora koparek oraz autora serwisu http://kryptowalutownia.pl\n\nW przeciągu 8 godzin pokażemy Wam:\n* jak zainstalować portfele oraz wymieniać się:\n  * trzema popularnymi kryptowalutami: Bitcoin, Ethereum, Monero,\n  * dwiema niszowymi: GridCoin, SiaCoin.\n* jak technicznie działają kryptowaluty od środka,\n* unikalne właściwości wybranych kryptowalut,\n* czym różnią się portfele webowe, instalowane oraz sprzętowe i jak bezpiecznie przechowywać swoje kryptowaluty,\n* jak handlować kryptowalutami na największej polskiej giełdzie, a także na jednej z zagranicznych,\n* jak wylgląda kopanie kryptowalut i czy warto,\n* kwestie podatkowe związane z handlem i kopaniem kryptowalut,\n* jakie zagrożenia czyhają na posiadaczy kryptowalut.\n\nNa szkolenie należy przyjść z własnym laptopem z sprawnym WiFi. Nie udzielamy porad finansowych - nie odpowiemy Wam na pytanie, w które kryptowaluty powinniście inwestować. Pokażemy Wam natomiast jak handlować i przechowywać kryptowaluty oraz naświetlimy szanse i ryzyka z tym związane.\n\nLokalizacja: **Poznań**\nTermin: **9 grudnia**, sobota, godz. 09:00 - 17:00\nKoszt na osobę:\n* **250 zł** za udział w szkoleniu,\n* 150 zł za które kupicie swoje pierwsze kryptowaluty.\n\nLiczba miejsc jest ograniczona - zapisy przyjmujemy do końca listopada.\n\n**Zainteresowanych** prosimy o kontakt mailowy: [email protected]",
      "json_metadata": "{\"tags\":[\"polish\",\"polski\",\"kryptowaluty\",\"cryptocurrency\",\"bitcoin\"],\"links\":[\"http://kryptowalutownia.pl\"],\"app\":\"steemit/0.1\",\"format\":\"markdown\"}"
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