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The VM Option Customize for the project settings is unable to parse the double equals which leads to scrambling the VM options command on save. The JAAS API (http://docs.oracle.com/javase/7/docs/jre/api/security/jaas/spec/com/sun/security/auth/login/ConfigFile.html) uses '==' as a override of JAAS configurations. For example, "-Djava.security.auth.login.config==../path/to/jaas.config" on save converts to "../path/to/jaas.config -Djava.security.auth.login.config" which is invalid. What is happening with the parsing is that it looks like two entries. One is "-Djava.security.auth.login.config" as a key with a empty string value and an empty string key with "../path/to/jaas.config" as the value. From the java.util.Properties documentation you can use a Unicode escape sequence of '\u003d' but that issues the literal escape characters to the JVM. At a minimum the customize dialog should issue a warning when either empty keys or empty values are found during parsing which would signal that the save is not going to work right.