java.lang.OutOfMemoryError: Java heap space

Open Source Development Extension Development
1

Hello all, @ewpatton
I can't generate one extensions i have this error can some one help please? i have increase java memory to 4096 but nothing change
the folder appinventor\components\build\externalComponents is created but can't generate DEX and got this error the size of the extension is around 3,5Mb

dexAllExtensions:

dexExtension:
     [java]
     [java] UNEXPECTED TOP-LEVEL ERROR:
     [java] java.lang.OutOfMemoryError: Java heap space
2

What operation is consuming more space?

3 
<!-- =====================================================================
       dexAllExtensions: create classes.dex for each extension.
       ===================================================================== -->
  <target name="dexAllExtensions" depends="jarAllExtensions">
    <foreach target="dexExtension" param="extension">
      <path>
        <fileset dir="${ExternalComponent-class.dir}" >
          <include name="*.jar"/>
        </fileset>
      </path>
    </foreach>
  </target>

  <target name="dexExtension" depends="">
    <basename property="extensionType" file="${extension}" suffix=".jar"/>
    <java jar="${lib.dir}/android/tools/dx.jar"
          fork="true"
          failonerror="true">
      <arg value="--dex"/>
      <arg value="--no-strict"/>
      <arg value="--output"/>
      <arg value="${ExternalComponent.dir}/${extensionType}/classes.jar"/>
      <arg value="${ExternalComponent-class.dir}/${extensionType}.jar"/>
    </java>
    <echo>Dexing extension: ${extensionType}</echo>
  </target>
4

Usually, this error is thrown when the Java Virtual Machine cannot allocate an object because it is out of memory, and no more memory could be made available by the garbage collector.

Therefore you pretty much have two options:

  • Increase the default memory your program is allowed to use using the -Xmx option (for instance for 1024 MB: -Xmx1024m)

  • Modify your program so that it needs less memory, using less big data structures and getting rid of objects that are not any more used at some point in your program

Increasing the heap size is a bad solution, 100% temporary. It will crash again in somewhere else. To avoid these issues, write high performance code.

  • Use local variables wherever possible.
  • Make sure you select the correct object (EX: Selection between String, StringBuffer and StringBuilder)
  • Use a good code system for your program(EX: Using static variables VS non static variables)
  • Other stuff which could work on your code.
  • Try to move with Multy Threading