Java APIs

Hi

I encounter an error "Error running C:\jdk1.5.0_06\bin\javac.exe compiler" when building my project using ant1.7.

My project has 10 eclipse plugins, and each plugin is compiled by invoking following ant target
<!-- ===================================================================
Compile specified plugin
target parameters:
param.plugin.dir: the plugin directory
param.plugin.targetJarFile: the name of jar file for the given plugin
param.plugin.src.dir: the folder name of source codes. Note: it is relative path name
param.fork: indicate if another process is forked to run javac
=================================================================== -->
<target name="compilePlugin">
<!-- Prepare compile environment -->
<!-- Delete obsolete build folder -->
<delete dir="${param.plugin.dir}/${build.dir}" quiet="true"/>
<!-- Delete obsolete jar file -->
<delete file="${param.plugin.dir}/${param.plugin.targetJarFile}" quiet="true"/>
<mkdir dir="${param.plugin.dir}/${build.dir}"/>

<!-- Compile source codes -->
<javac srcdir="${param.plugin.dir}/${param.plugin.src.dir}"
destdir="${param.plugin.dir}/${build.dir}"
failonerror="${javacFailOnError}"
verbose="${javacVerbose}"
debug="${javacDebugInfo}"
deprecation="${javacDeprecation}"
optimize="${javacOptimize}"
source="${javacSource}"
target="${javacTarget}"
fork="${param.fork}" memoryInitialSize="256m" memoryMaximumSize="512m">
<classpath refid="compile.classpath" />
</javac>

<!-- Create plugin jar file -->
<copy todir="${param.plugin.dir}/${build.dir}" failonerror="true">
<fileset dir="${param.plugin.dir}/${param.plugin.src.dir}" excludes="**/*.java, **/package.htm*" />
</copy>
<jar jarfile="${param.plugin.dir}/${param.plugin.targetJarFile}" basedir="${param.plugin.dir}/${build.dir}"/>
<delete dir="${param.plugin.dir}/${build.dir}" quiet="true"/>
</target>

Since each of first 9 plugins contains less than 500 java source files, we always set "param.fork" to false when invoking this ant target.

For the 10th plugin, it has about 1000 source files. If we set "param.fork" to false, we will get the error "Error running javac.exe compiler". So we have to set "param.fork" to true when compiling it. This week, this plugin contains about 1250 files and we get the same error again when compiling it. I tried to increase the "memoryMaximumSize" to "768", but still couldn't get through it.
BTW, There are about 150 jar files in our classpath for compiling plugins. Do many jar files cause this problem?

Any help is highly appreciated.

Many thanks

Oceanman