maven compiles java projects in jdk 1.4 mode while running java 1.7?

Question

I have a big maven project divided to some modules.

I decided to give the pmd (code quality check) module with maven.

when I try to test the pmd module using the command

mvn pmd:pmd

I get the following types of warnings:

• Can't use generics unless running in JDK 1.5 mode!
• Can't use annotations when running in JDK 1.4 mode!
• Can't use enum as a keyword in pre-JDK 1.5 target

looks like maven compiles the projects using jdk 1.4 for some reason.

java -version output:

java version "1.7.0_05"
OpenJDK Runtime Environment (IcedTea7 2.2.1) (Gentoo build 1.7.0_05-b21)
OpenJDK 64-Bit Server VM (build 23.0-b21, mixed mode)

I use gentoo linux.

Linux ufk-work 3.5.2-gentoo #1 SMP Sun Aug 19 18:58:32 IDT 2012 x86_64 Intel(R) Core(TM) i7-3770 CPU @ 3.40GHz GenuineIntel GNU/Linux

mvn -version output:

Apache Maven 3.0.4 (r1232337; 2012-01-17 10:44:56+0200)
Maven home: /usr/share/maven-bin-3.0
Java version: 1.7.0_05, vendor: Oracle Corporation
Java home: /usr/lib64/icedtea7/jre
Default locale: en_US, platform encoding: ANSI_X3.4-1968
OS name: "linux", version: "3.5.2-gentoo", arch: "amd64", family: "unix"

so any ideas how to make sure that maven will compile for jdk 1.7 and not 1.4 ?

I googled and found usage examples of the maven-compiler-plugin as found in the following url: http://twit88.com/blog/2008/03/09/maven-compile-your-application-to-be-14-15-or-16-compatible/

unfortunately the results are exactly the same.

any information regarding the issue would be greatly appreciated.

thank you so much!

kfir

update

I tried adding the maven-compiler-plugin and the maven-pmd-plugin to my main pom.xml but the results are exactly the same.

the updated pom.xml can view at http://bpaste.net/show/41166/

Answer 1

What you need is to tell the target version of PMD:

<build>
  <pluginManagement>
    <plugins>
      <plugin>
      <groupId>org.apache.maven.plugins</groupId>
      <artifactId>maven-pmd-plugin</artifactId>
      <version>2.7.1</version>
      <configuration>
          <targetJdk>1.7</targetJdk>
          <rulesets>
              <ruleset>tools/pmd-rules.xml</ruleset>
          </rulesets>
      </configuration>
    </plugin>
    <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-compiler-plugin</artifactId>
        <version>2.5.1</version>
        <configuration>
            <source>1.7</source>
            <target>1.7</target>
        </configuration>
    </plugin>

    </plugins>
  </pluginManagement>
</build>

<reporting>
    <plugins>
        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-pmd-plugin</artifactId>
            <version>2.7.1</version>
        </plugin>
    </plugins>
</reporting>

Note: A few month ago the 1.7 JDK was not supported, you should double check it in the documentation, otherwise you won't be able to use the diamond syntax.