JDK and Maven Confliction - maven

Question

I am using Eclipse Juno integrated with maven plugin.
I have installed JDK 1.6 on my system.
My environment variables are
JAVA_HOME - F:\Program Files\Java\jdk1.6.0_37
MAVEN_HOME - F:\apache-maven-3.0.4
classpath - ;.;%JAVA_HOME%\lib\tools.jar;
Path - C:\Program Files\AMD APP\bin\x86;C:\Program Files\Common Files\Microsoft Shared\Windows Live;%SystemRoot%\system32;%SystemRoot%;%SystemRoot%\System32\Wbem;%SYSTEMROOT%\System32\WindowsPowerShell\v1.0\;C:\Program Files\ATI Technologies\ATI.ACE\Core-Static;C:\Program Files\Windows Live\Shared;C:\Program Files\QuickTime\QTSystem\;.;%JAVA_HOME%\bin;%MAVEN_HOME%\bin;
My JDK and JRE are working smooth.
Command Line Check :
In my eclipse I am building a new maven web project which should give me a war file.
My pom.xml :
<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>com.achutha.labs</groupId>
<artifactId>01JsfExample</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>war</packaging>
<name>01JsfExample</name>
<dependencies>
<dependency>
<groupId>com.sun.faces</groupId>
<artifactId>jsf-api</artifactId>
<version>2.1.7</version>
</dependency>
<dependency>
<groupId>com.sun.faces</groupId>
<artifactId>jsf-impl</artifactId>
<version>2.1.7</version>
</dependency>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>jstl</artifactId>
<version>1.2</version>
</dependency>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>servlet-api</artifactId>
<version>2.5</version>
</dependency>
<dependency>
<groupId>javax.servlet.jsp</groupId>
<artifactId>jsp-api</artifactId>
<version>2.1</version>
</dependency>
</dependencies>
<build>
<finalName>JavaServerFaces</finalName>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>2.3.1</version>
<configuration>
<source>1.6</source>
<target>1.6</target>
</configuration>
</plugin>
</plugins>
</build>
</project>
If I do maven clean, its a success.
But when i do maven install it is giving some jdk issues.
SLF4J: Failed to load class "org.slf4j.impl.StaticLoggerBinder".
SLF4J: Defaulting to no-operation (NOP) logger implementation
SLF4J: See http://www.slf4j.org/codes.html#StaticLoggerBinder for further details.
[INFO] Scanning for projects...
[INFO]
[INFO] ------------------------------------------------------------------------
[INFO] Building 01JsfExample 0.0.1-SNAPSHOT
[INFO] ------------------------------------------------------------------------
[INFO]
[INFO] --- maven-resources-plugin:2.5:resources (default-resources) # 01JsfExample ---
[debug] execute contextualize
[WARNING] Using platform encoding (Cp1252 actually) to copy filtered resources, i.e. build is platform dependent!
[INFO] Copying 0 resource
[INFO]
[INFO] --- maven-compiler-plugin:2.3.1:compile (default-compile) # 01JsfExample ---
[WARNING] File encoding has not been set, using platform encoding Cp1252, i.e. build is platform dependent!
[INFO] Compiling 1 source file to F:\Workspace\01JsfExample\target\classes
[INFO] -------------------------------------------------------------
[ERROR] COMPILATION ERROR :
[INFO] -------------------------------------------------------------
[ERROR] Unable to locate the Javac Compiler in:
F:\Program Files\Java\jre6\..\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] 1error
[INFO] -------------------------------------------------------------
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 0.554s
[INFO] Finished at: Mon Dec 10 06:54:01 IST 2012
[INFO] Final Memory: 3M/15M
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:2.3.1:compile (default-compile) on project 01JsfExample: Compilation failure
[ERROR] Unable to locate the Javac Compiler in:
[ERROR] F:\Program Files\Java\jre6\..\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
My other java programs on eclipse are compiling and running fine.
Except for maven projects. The war file is not getting generated as build is failure due to the above reason.
How to solve this issue ?

Answer 1

Are you running Maven goals in Eclipse? If so, it looks like Eclipse is trying to access the JRE as opposed to the JDK: F:\Program Files\Java\jre6\..\lib\tools.jar
Although JAVA_HOME seems to be set correctly at the Windows level, it could be that in Eclipse you're running the app with a JRE, not a JDK. In Eclipse, have a look at the installed JREs list (Window -> Preferences -> Java -> Installed JREs). If you don't have a JDK, click on 'Edit' after selecting the JRE and in that dialog box enter the location to the JDK.

Answer 2

I am assuming that you are trying to use maven install option from eclipse. Try mvn install from command line. If that fails the issue is with java setup ( installation, path, variable ). Recheck whether your java home is correctly pointing to jdk and not jre. Also ensure eclipse javaw.exe from jdk bin directory.
If cmd line install works then issue is with eclipse java configuration for your maven project. You can try resolving it by -
You should verify the project properties set up in eclipse to ensure the java runtime is the correct one.
You should verify in the project facet the java compilation is set to 1.6
You should set java compilation information in pom.xml sourcejdk and targetjdk tags.