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javamavenubuntuubuntu-12.04bitnami

Bitnami Tomcat Stack Maven fails to compile

Used Bitnami Tomcat Stack to create a instance in EC2 . Everything works perfect in matter of few mins. But at final stage to deploy application maven is failing to compile the source code. Eventhoug JAVA_HOME is perfectly set it is failing to compile with below error log.

root@ip-172-31-18-89:/mnt/apps/stutzen-backend# echo $JAVA_HOME
/opt/bitnami/java
root@ip-172-31-18-89:/mnt/webapps/stutzen-backend# mvn compile
[INFO] Scanning for projects...
[INFO]                                                                         
[INFO] ------------------------------------------------------------------------
[INFO] Building ware27 0.0.1-SNAPSHOT
[INFO] ------------------------------------------------------------------------
[INFO] 
[INFO] --- maven-resources-plugin:2.3:resources (default-resources) @ ware27 ---
[INFO] Using 'UTF-8' encoding to copy filtered resources.
[INFO] Copying 4 resources
[INFO] 
[INFO] --- maven-compiler-plugin:2.3.2:compile (default-compile) @ ware27 ---
[INFO] Compiling 34 source files to /mnt/webapps/stutzen-backend/target/classes
[INFO] -------------------------------------------------------------
[ERROR] COMPILATION ERROR : 
[INFO] -------------------------------------------------------------
[ERROR] Unable to locate the Javac Compiler in:
  /opt/bitnami/java/../lib/tools.jar
Please ensure you are using JDK 1.4 or above and
not a JRE (the com.sun.tools.javac.Main class is required).
In most cases you can change the location of your Java
installation by setting the JAVA_HOME environment variable.
[INFO] 1 error
[INFO] -------------------------------------------------------------
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 11.245s
[INFO] Finished at: Sun Jul 13 10:37:54 UTC 2014
[INFO] Final Memory: 6M/25M
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:2.3.2:compile (default-compile) on project ware27: Compilation failure
[ERROR] Unable to locate the Javac Compiler in:
[ERROR] /opt/bitnami/java/../lib/tools.jar
[ERROR] Please ensure you are using JDK 1.4 or above and
[ERROR] not a JRE (the com.sun.tools.javac.Main class is required).
[ERROR] In most cases you can change the location of your Java
[ERROR] installation by setting the JAVA_HOME environment variable.
[ERROR] -> [Help 1]
[ERROR] 
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR] 
[ERROR] For more information about the errors and possible solutions, please read the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/MojoFailureException

How to deal with it ?

Solution

  • The issue is that the maven compiler plugin is configured by default to use the a Java 1.5 compiler (see the source and target options in the official documentation) while Bitnami Tomcat Stack is includes Java 1.7. You will need to configure your projects to use Java 1.7 instead. For this you can define a different value for the maven.compiler.source and maven.compiler.target properties or define the maven.compiler.compilerVersion instead which will work as well. In both cases you need to set maven.compiler.fork to true. The example below shows how to configure this per project:

    pom.xml:

    <project>
(...)
  <properties>
    <maven.compiler.compilerVersion>1.7</maven.compiler.compilerVersion>
    <maven.compiler.fork>true</maven.compiler.fork>
  </properties>
(...)
</project>

    However you will likely want to define these settings as global settings for all your projects. In that case you can edit the settings.xml in ($M2_HOME/conf/settings.xml) and define a profile which will be always actived:

    <settings xmlns="http://maven.apache.org/SETTINGS/1.0.0" ...>
(...)
  <profiles>
    <profile>
      <id>env-dev</id>
      <properties>
        <maven.compiler.compilerVersion>1.7</maven.compiler.compilerVersion>
        <maven.compiler.fork>true</maven.compiler.fork>
      </properties>
    </profile>
  </profiles>
  <activeProfiles>
    <activeProfile>env-dev</activeProfile>
  </activeProfiles>
</settings>