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  1. To check: Run java -version on the command line
  2. If not correct, download the J2SE SDK (make sure you get the JDK and not JRE) from:
  3. Install it (the SDK) to /opt/java
    • Note: Install the JRE to a different directory (probably the default, especially under windows) or you will have problems
  4. Set environment variable: JAVA_HOME=/opt/java
    • Mac users: JAVA_HOME=/Library/Java/Home
    • Windows users default: JAVA_HOME=C:\j2sdkXXX (where "XXX" is the version - for example "j2sdk1.7.0_11")
  5. Add $JAVA_HOME/bin to PATH
  6. Set JAVA_OPTS for tomcat in the tomcat/bin/setenv file (see Install Tomcat 7 / 8)

    export JAVA_OPTS="-server -Xmx1028m -XX:MaxPermSize=320m -Djava.awt.headless=true -Dsun.lang.ClassLoader.allowArraySyntax=true"
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