When RPG starts the Java Virtual Machine (JVM), there are several options that control how the JVM is started. See the Java System Properties section in the i5/OS Information Center.
To specify options in the QIBM_RPG_JAVA_PROPERTIES environment variable, you code the options in a string, one after the other, separated by any character that does not appear in any of the options. Then you end the string with the separator character. For example, if you want to specify the options
java.version=1.4
os400.stderr=file:stderr.txt
then you would add the environment variable using the following command:
ADDENVVAR ENVVAR(QIBM_RPG_JAVA_PROPERTIES)
VALUE('-Djava.version=1.4;-Dos400.stderr=file:stderr.txt;')
If the options string is not valid, Java may reject one of the options. Message JVAB55A will appear in the joblog indicating which option was not valid. If this happens, RPG will try to start the JVM again without any of the options, but still including the java.class.path option if it came from the CLASSPATH environment variable.
Some parameters and return values require conversion between the job CCSID and the CCSID that Java uses for byte arrays. The file.encoding Java property is used by RPG to obtain the CCSID that Java uses. Ensure that the file.encoding property is set correctly for your job CCSID. You can allow Java to set the property implicitly using attributes of your job, or you can set the property explicitly using one of the mechanisms above. For example, you could add '-Dfile.encoding=ISO8859_1' or '-Dfile.encoding=Cp948' to your QIBM_RPG_JAVA_PROPERTIES environment variable. For more information about the file.encoding property, see the IBM Developer Kit for Java topic in the Information Center.