AllowRaggedArrays[True] lets you pass ragged (i.e., non rectangular) arrays to Java. AllowRaggedArrays[False] restores the default behavior.

BeginJavaBlock[] begins an evaluation block equivalent to a JavaBlock, except that it works across a larger span than the evaluation of a single expression.

EndJavaBlock[] ends an evaluation block equivalent to a JavaBlock, except that it works across a larger span than the evaluation of a single expression.

JavaClass[classname, n] represents a Java class with the specified name.

JavaLink[] returns the MathLink LinkObject that is used to communicate with the J/Link Java runtime.

JavaNew[classname] constructs a Java object of the specified class. JavaNew[classname, args] constructs a Java object of the specified class, passing the arguments args to ...

JavaObjectQ[expr] gives True if expr is a reference to a Java object or Null, and gives False otherwise.

Periodical[id] returns information about the periodical task corresponding to the specified integer id.

Periodicals[] returns a list of integer ID numbers corresponding to the set of operations that are periodically performed automatically when the kernel is not busy with ...

RemovePeriodical[id] removes the computation corresponding to the integer id from the set of operations that are periodically performed automatically.