Re: [tycho-user] Work around for Maven persistently using JDK 1.5 by def

[Nick Boldt <nickboldt@xxxxxxxxx>]

Do your MANIFEST.MF files specify JDK 8 too? 

If not, set this in your plugins' manifests:

Bundle-RequiredExecutionEnvironment: JavaSE-1.8

On Wed, Mar 15, 2017 at 1:11 PM, khady lo seck <khady.engineering@xxxxxxxxx> wrote:

Hello, 

I am running Maven Tycho on an Eclipse Project that is using Java 8. The whole system knows I am using JDK 1.8. and even my POM mentions it. 

<plugin>

<groupId>org.apache.maven.plugins</groupId>

   <artifactId>maven-compiler-plugin</artifactId>

   <version>3.5.1</version>

   <configuration>

          <source>1.8</source>

          <target>1.8</target>

     <compilerId>groovy-eclipse-compiler</compilerId>

     <verbose>true</verbose>   

     <fork>true</fork> 

     <compilerArguments>

       <javaAgentClass>lombok.launch.Agent</javaAgentClass>

     </compilerArguments>

   </configuration>

...

I tried different things to work around the issue including using org.codehaus.mojo and specifying 1.8 in the manifest.mf. 

<plugin>

<groupId>org.codehaus.mojo</groupId>

<artifactId>build-helper-maven-plugin</artifactId>

<version>1.5</version>

 <executions>

   <execution>

     <phase>validate</phase>

     <goals>

       <goal>maven-version</goal>

     </goals>

   </execution>

 </executions>

</plugin> 

but regardless I have  the same error due to Maven using jdk 1.5 regardless of what is written in pom and manifest. 

Failed to execute goal org.eclipse.tycho:tycho-compiler-plugin:1.0.0:compile (default-compile) on project com.company.bbcode.parser: Compilation failure: Compilation failure:

...

 Lambda expressions are allowed only at source level 1.8 or above

In my POM I mentioned as one of the plugins

<plugin>

<groupId>org.apache.maven.plugins</groupId>

    <artifactId>maven-compiler-plugin</artifactId>

    <version>3.5.1</version>

    <configuration>

          <source>1.8</source>

          <target>1.8</target>

      <compilerId>groovy-eclipse-compiler</compilerId>

      <verbose>true</verbose>   

      <fork>true</fork> 

      <compilerArguments>

        <javaAgentClass>lombok.launch.Agent</javaAgentClass>

      </compilerArguments>

    </configuration>

    <dependencies>

        <dependency>

            <groupId>org.codehaus.groovy</groupId>

            <artifactId>groovy-eclipse-compiler</artifactId>

            <version>2.9.1-01</version>

        </dependency>

        <!-- for 2.8.0-01 and later you must have an explicit dependency on groovy-eclipse-batch -->

        <dependency>

            <groupId>org.codehaus.groovy</groupId>

            <artifactId>groovy-eclipse-batch</artifactId>

            <version>2.3.7-01</version>

        </dependency>

        <dependency>

            <groupId>com.company.lombok</groupId>

            <artifactId>lombok</artifactId>

            <version>1.16.8</version>

        </dependency>

    </dependencies>

</plugin>

--

Best regards, 

Khady L. Seck

Full Stack Java Developer

Tel: 438-830-4117

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--

Nick Boldt :: Productization Lead :: JBoss Tools & Dev Studio :: Red Hat, Inc.
http://nick.divbyzero.com