The compilation of static methods should be excluded when generating the proxy.

[CrazyHZM]

In jdk8 the interface supports static method.
The compilation of static methods should be excluded when generating the proxy.
If not excluded, the following exception will be thrown：

Caused by: compile error: not available in a static method: handler
	at javassist.compiler.MemberCodeGen.fieldAccess(MemberCodeGen.java:1037)
	at javassist.compiler.MemberCodeGen.atFieldRead(MemberCodeGen.java:867)
	at javassist.compiler.MemberCodeGen.atMember(MemberCodeGen.java:862)
	at javassist.compiler.JvstCodeGen.atMember(JvstCodeGen.java:112)
	at javassist.compiler.ast.Member.accept(Member.java:39)
	at javassist.compiler.MemberCodeGen.atCallExpr(MemberCodeGen.java:510)
	at javassist.compiler.JvstCodeGen.atCallExpr(JvstCodeGen.java:244)
	at javassist.compiler.ast.CallExpr.accept(CallExpr.java:46)
	at javassist.compiler.CodeGen.atAssignCore(CodeGen.java:877)
	at javassist.compiler.CodeGen.atVariableAssign(CodeGen.java:810)
	at javassist.compiler.CodeGen.atDeclarator(CodeGen.java:744)
	at javassist.compiler.ast.Declarator.accept(Declarator.java:100)
	at javassist.compiler.CodeGen.atStmnt(CodeGen.java:351)
	at javassist.compiler.ast.Stmnt.accept(Stmnt.java:50)
	at javassist.compiler.CodeGen.atStmnt(CodeGen.java:351)
	at javassist.compiler.ast.Stmnt.accept(Stmnt.java:50)
	at javassist.compiler.CodeGen.atMethodBody(CodeGen.java:292)
	at javassist.compiler.CodeGen.atMethodDecl(CodeGen.java:274)
	at javassist.compiler.ast.MethodDecl.accept(MethodDecl.java:44)
	at javassist.compiler.Javac.compileMethod(Javac.java:169)
	at javassist.compiler.Javac.compile(Javac.java:95)
	at javassist.CtNewMethod.make(CtNewMethod.java:74)