调用dubbo服务提示：java.io.IOException: invalid constant type: 18

通过dubbo获取某个服务报错，但单元测试也能通过，其他服务正常，调试了半天，很是纳闷，异常如下：

Error creating bean with name 'common-service': FactoryBean threw exception on object creation; nested exception is java.lang.RuntimeException: java.io.IOException: invalid constant type: 18] with root cause

java.io.IOException: invalid constant type: 18

at javassist.bytecode.ConstPool.readOne(ConstPool.java:1027)

at javassist.bytecode.ConstPool.read(ConstPool.java:970)

at javassist.bytecode.ConstPool.<init>(ConstPool.java:127)

at javassist.bytecode.ClassFile.read(ClassFile.java:716)

at javassist.bytecode.ClassFile.<init>(ClassFile.java:103)

at javassist.CtClassType.getClassFile2(CtClassType.java:190)

at javassist.CtClassType.subtypeOf(CtClassType.java:303)

at javassist.CtClassType.subtypeOf(CtClassType.java:318)

at javassist.compiler.MemberResolver.compareSignature(MemberResolver.java:247)

at javassist.compiler.MemberResolver.lookupMethod(MemberResolver.java:119)

at javassist.compiler.MemberResolver.lookupMethod(MemberResolver.java:96)

at javassist.compiler.TypeChecker.atMethodCallCore(TypeChecker.java:704)

at javassist.compiler.TypeChecker.atCallExpr(TypeChecker.java:681)

at javassist.compiler.JvstTypeChecker.atCallExpr(JvstTypeChecker.java:156)

at javassist.compiler.ast.CallExpr.accept(CallExpr.java:45)

at javassist.compiler.JvstTypeChecker.atCastToWrapper(JvstTypeChecker.java:125)

at javassist.compiler.JvstTypeChecker.atCastExpr(JvstTypeChecker.java:97)

at javassist.compiler.ast.CastExpr.accept(CastExpr.java:54)

at javassist.compiler.CodeGen.doTypeCheck(CodeGen.java:241)

at javassist.compiler.CodeGen.compileExpr(CodeGen.java:228)

at javassist.compiler.CodeGen.atReturnStmnt2(CodeGen.java:597)

at javassist.compiler.JvstCodeGen.atReturnStmnt(JvstCodeGen.java:424)

at javassist.compiler.CodeGen.atStmnt(CodeGen.java:362)

at javassist.compiler.ast.Stmnt.accept(Stmnt.java:49)

at javassist.compiler.CodeGen.atStmnt(CodeGen.java:350)

at javassist.compiler.ast.Stmnt.accept(Stmnt.java:49)

at javassist.compiler.CodeGen.atIfStmnt(CodeGen.java:390)

at javassist.compiler.CodeGen.atStmnt(CodeGen.java:354)

at javassist.compiler.ast.Stmnt.accept(Stmnt.java:49)

at javassist.compiler.CodeGen.atStmnt(CodeGen.java:350)

at javassist.compiler.ast.Stmnt.accept(Stmnt.java:49)

at javassist.compiler.MemberCodeGen.atTryStmnt(MemberCodeGen.java:203)

at javassist.compiler.CodeGen.atStmnt(CodeGen.java:366)

at javassist.compiler.ast.Stmnt.accept(Stmnt.java:49)

at javassist.compiler.CodeGen.atStmnt(CodeGen.java:350)

at javassist.compiler.ast.Stmnt.accept(Stmnt.java:49)

at javassist.compiler.CodeGen.atMethodBody(CodeGen.java:291)

at javassist.compiler.CodeGen.atMethodDecl(CodeGen.java:273)

at javassist.compiler.ast.MethodDecl.accept(MethodDecl.java:43)

at javassist.compiler.Javac.compileMethod(Javac.java:168)

at javassist.compiler.Javac.compile(Javac.java:94)

at javassist.CtNewMethod.make(CtNewMethod.java:73)

at javassist.CtNewMethod.make(CtNewMethod.java:44)

at com.alibaba.dubbo.common.bytecode.ClassGenerator.toClass(ClassGenerator.java:281)

at com.alibaba.dubbo.common.bytecode.ClassGenerator.toClass(ClassGenerator.java:256)

at com.alibaba.dubbo.common.bytecode.Wrapper.makeWrapper(Wrapper.java:239)

at com.alibaba.dubbo.common.bytecode.Wrapper.getWrapper(Wrapper.java:101)

at com.alibaba.dubbo.config.ReferenceConfig.init(ReferenceConfig.java:290)

at com.alibaba.dubbo.config.ReferenceConfig.get(ReferenceConfig.java:159)

at com.alibaba.dubbo.config.spring.ReferenceBean.getObject(ReferenceBean.java:65)

at org.springframework.beans.factory.support.FactoryBeanRegistrySupport.doGetObjectFromFactoryBean(FactoryBeanRegistrySupport.java:168)

at org.springframework.beans.factory.support.FactoryBeanRegistrySupport.getObjectFromFactoryBean(FactoryBeanRegistrySupport.java:103)

at org.springframework.beans.factory.support.AbstractBeanFactory.getObjectForBeanInstance(AbstractBeanFactory.java:1590)

at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:254)

at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197)

at org.springframework.context.support.AbstractApplicationContext.getBean(AbstractApplicationContext.java:1054)

异常原因：
javasist冲突，dubbo中自动引入javasist-3.2.0.GA.jar
struts-core中引入了javasist-3.1.1.0.GA.jar

解决办法：
<!-- struts -->

        <dependency>

            <groupId>org.apache.struts</groupId>

            <artifactId>struts2-core</artifactId>

            <version>2.3.24</version>

            <exclusions>

                 <exclusion>  

                    <groupId>javassist</groupId>  

                    <artifactId>javassist</artifactId>  

                </exclusion>

            </exclusions>

        </dependency>

解决方式：