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https://jira.codehaus.org/browse/MCOMPILER-144?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=309809#comment-309809
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David M. Lloyd commented on MCOMPILER-144:
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https://github.com/sonatype/plexus-compiler/pull/6 (PLXCOMP-1) is relevant here.
> Using compiler API instead of tools.jar
> ---------------------------------------
>
> Key: MCOMPILER-144
> URL: https://jira.codehaus.org/browse/MCOMPILER-144
> Project: Maven 2.x Compiler Plugin
> Issue Type: New Feature
> Reporter: Markus KARG
> Priority: Minor
>
> Currently (MVN 3.0) java compilation needs tools.jar provided by the Sun JDK:
> [ERROR] Unable to locate the Javac Compiler in:
> [ERROR] C:\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.
> In fact, this is bad because (a) it assumes that a full JDK is installed just
> for this sole tool where a JRE would be sufficient, (b) tools.jar is not
> contained in any standards documents and such possibly is not existing on
> future or non-sun JDK.
> Since JRE 6 (i. e. for many years) the JRE (not JDK!) comes with a
> standardized (!) API for compilation: The Java Compiler API. It would make
> sense to use that standardized API instead of forcing the user to have Sun
> JDK installed.
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