Configuring a JDK in JBuilder:-

The last option on the Configure JDKs dialog is the JDK home path. You should always debug with the –classic option. This option does not pertain to JDK 1.4.x and higher—only the Java 2 version up to JDK 1.3.0, as used in the example. Java and JBuilder use a special VM called Hotspot, which can drastically improve performance across the board. When using the Hotspot VM, however, certain debug information was lost or not available (such as synchronization and thread information). The –classic option made the JVM run in a normal mode not utilizing the aggressive optimization of the Hotspot VM, thus allowing the information in a debug session to be as accurate as possible.

Normally, the wizard will check to see if a classic JVM is present during the JDK definition phase. If it is, it must be a version earlier than JDK 1.3.1; if it determines that a problem may exist, it will set the flag automatically. This can be turned on as a default and then overridden using the VM parameters in the project properties with parameters native, hotspot, green, or server.