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[tycho-user] Tycho out-of-the-box support for Java 8
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Hello everyone!
I am trying to build a Java 8 eclipse plug-in-project via maven, but the tycho-compiler fails. I've created the plug-in project using the latest Eclipse Luna M6 (4.4.0M6).
The manifest of my simple bundle looks like this:
Manifest-Version: 1.0
Bundle-ManifestVersion: 2
Bundle-Name: MyBundle
Bundle-SymbolicName: MyBundle
Bundle-Version: 1.0.0
Bundle-RequiredExecutionEnvironment: JavaSE-1.8
The pom.xml file looks like this:
<project xmlns="http://maven.apache.org/POM/4.0.0"; xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance";
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd";>
<modelVersion>4.0.0</modelVersion>
<groupId>MyBundle</groupId>
<artifactId>MyBundle</artifactId>
<version>1.0.0</version>
<packaging>eclipse-plugin</packaging>
<properties>
<tycho-version>0.20.0</tycho-version>
</properties>
<build>
<plugins>
<plugin>
<groupId>org.eclipse.tycho</groupId>
<artifactId>target-platform-configuration</artifactId>
<version>${tycho-version}</version>
<configuration>
<pomDependencies>consider</pomDependencies>
<!-- configure the p2 target environments for multi-platform build -->
<environments>
<environment>
<os>win32</os>
<ws>win32</ws>
<arch>x86</arch>
</environment>
<!-- Required if you run tests on a x64 machine -->
<environment>
<os>win32</os>
<ws>win32</ws>
<arch>x86_64</arch>
</environment>
</environments>
</configuration>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>2.3.2</version>
<configuration>
<!--<encoding>UTF-8</encoding> -->
<source>1.8</source>
<target>1.8</target>
</configuration>
</plugin>
<plugin>
<groupId>org.eclipse.tycho</groupId>
<artifactId>tycho-maven-plugin</artifactId>
<version>${tycho-version}</version>
<extensions>true</extensions>
<configuration>
<encoding>UTF-8</encoding>
<source>1.8</source>
<target>1.8</target>
</configuration>
</plugin>
<plugin>
<groupId>org.eclipse.tycho</groupId>
<artifactId>tycho-compiler-plugin</artifactId>
<version>${tycho-version}</version>
<!-- uncommenting the following block results in a cannot-resolve-dependency error -->
<!--
<dependencies>
<dependency>
<groupId>org.eclipse.tycho</groupId>
<artifactId>org.eclipse.jdt.core</artifactId>
<version>3.9.2.v20140119-0104_BETA_JAVA8</version>
</dependency>
<dependency>
<groupId>org.eclipse.tycho</groupId>
<artifactId>org.eclipse.jdt.compiler.apt</artifactId>
<version>1.0.600.v20140119-0104_BETA_JAVA8</version>
</dependency>
</dependencies>
-->
</plugin>
<plugin>
<groupId>org.eclipse.tycho</groupId>
<artifactId>tycho-source-plugin</artifactId>
<version>${tycho-version}</version>
<executions>
<execution>
<id>plugin-source</id>
<goals>
<goal>plugin-source</goal>
</goals>
</execution>
</executions>
</plugin>
</plugins>
</build>
</project>
If I run "mvn clean compile install" it will fail with the following error message:
[ERROR] Failed to execute goal org.eclipse.tycho:tycho-compiler-plugin:0.20.0:compile (default-compile) on project MyBundle: Fatal error compiling: target level should be comprised in between '1.1' an
d '1.7' (or '5', '5.0', ..., '7' or '7.0') or cldc1.1: 1.8 -> [Help 1]
Also, if I change the execution environment to 1.7 (both in the MANIFEST and the pom file) it cannot compile Java 8 features like lambdas.
Do you know which version of tycho is going to support the Java 8 features out-of-the-box (not using BETA_JAVA8 plugins anymore) and when this version is going online?
To workaround the problems shown above, I've also been trying to use the maven configuration suggested in this post http://dev.eclipse.org/mhonarc/lists/tycho-user/msg05279.html. I am afraid that I cannot find the latest BETA_JAVA8 dependencies of org.eclipse.tycho:org.eclipse.jdt.core and org.eclipes.tycho:org.eclipse.jdt.compiler.apt. Could someone tell me where I can get those dependencies?
Yours sincerely,
Fabian
