@ Override public void visitClassContext ( ClassContext classContext ) { try { if ( ( throwableClass != null ) && ! isPre14Class ( classContext . getJavaClass ( ) ) ) { stack = new OpcodeStack ( ) ; catchInfos = new HashSet <> ( ) ; exReg = new HashMap <> ( ) ; super . visitClassContext ( classContext ) ; } } finally { stack = null ; catchInfos = null ; exceptions = null ; exReg = null ; } }
implements the visitor to make sure the jdk is 1 . 4 or better