[java] How is the default max Java heap size determined?

For the IBM JVM, the command is the following:

java -verbose:sizes -version

For more information about the IBM SDK for Java 8: http://www-01.ibm.com/support/knowledgecenter/SSYKE2_8.0.0/com.ibm.java.lnx.80.doc/diag/appendixes/defaults.html?lang=en

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