Java. Lang. classcastexception: $ proxy17 cannot be cast to *. Service. impl. deviceservice

Error:

 

Java. lang. classcastexception: $ proxy17 cannot be cast *. *. *. service. impl. deviceserviceat *. *. *. service. impl. deviceservicetest. testdeviceisonline (deviceservicetest. java: 436) at Sun. reflect. nativemethodaccessorimpl. invoke0 (native method) at Sun. reflect. nativemethodaccessorimpl. invoke (nativemethodaccessorimpl. java: 39) at Sun. reflect. delegatingmethodaccessorimpl. invoke (delegatingmethodaccessorimpl. java: 25) at java. lang. reflect. method. invoke (method. java: 597) at Org. JUnit. runners. model. frameworkmethod $1. runreflectivecall (frameworkmethod. java: 47) at Org. JUnit. internal. runners. model. reflectivecallable. run (reflectivecallable. java: 12) at Org. JUnit. runners. model. frameworkmethod. invokeexplosively (frameworkmethod. java: 44) at Org. JUnit. internal. runners. statements. invokemethod. evaluate (invokemethod. java: 17) at Org. JUnit. internal. runners. statements. runbefores. evaluate (runbefores. java: 26) at Org. springframework. test. context. junit4.statements. runbeforetestmethodcallbacks. evaluate (runbeforetestmethodcallbacks. java: 74) at Org. springframework. test. context. junit4.statements. runaftertestmethodcallbacks. evaluate (runaftertestmethodcallbacks. java: 83) at Org. springframework. test. context. junit4.statements. springrepeat. evaluate (springrepeat. java: 72) at Org. springframework. test. context. junit4.springjunit4classrunner. runchild (springjunit4classrunner. java: 231) at Org. JUnit. runners. blockjunit4classrunner. runchild (blockjunit4classrunner. java: 50) at Org. JUnit. runners. parentrunner $ 3.run( parentrunner. java: 238) at Org. JUnit. runners. parentrunner $1. schedule (parentrunner. java: 63) at Org. JUnit. runners. parentrunner. runchildren (parentrunner. java: 236) at Org. JUnit. runners. parentrunner. access $000 (parentrunner. java: 53) at Org. JUnit. runners. parentrunner $2. evaluate (parentrunner. java: 229) at Org. springframework. test. context. junit4.statements. runbeforetestclasscallbacks. evaluate (runbeforetestclasscallbacks. java: 61) at Org. springframework. test. context. junit4.statements. runaftertestclasscallbacks. evaluate (runaftertestclasscallbacks. java: 71) at Org. JUnit. runners. parentrunner. run (parentrunner. java: 309) at Org. springframework. test. context. junit4.springjunit4classrunner. run (springjunit4classrunner. java: 174) at Org. eclipse. jdt. internal. junit4.runner. junit4testreference. run (junit4testreference. java: 50) at Org. eclipse. jdt. internal. JUnit. runner. testexecution. run (testexecution. java: 38) at Org. eclipse. jdt. internal. JUnit. runner. remotetestrunner. runtests (remotetestrunner. java: 467) at Org. eclipse. jdt. internal. JUnit. runner. remotetestrunner. runtests (remotetestrunner. java: 683) at Org. eclipse. jdt. internal. JUnit. runner. remotetestrunner. run (remotetestrunner. java: 390) at Org. eclipse. jdt. internal. JUnit. runner. remotetestrunner. main (remotetestrunner. java: 197)

Cause:

 

 

Written in the spring document: Spring AOP uses JDK dynamic proxy or cglib to create a proxy for the target object. If the proxy target implements at least one interface, JDK dynamic proxy is used. All interfaces implemented for this target type will be proxies. If the target object does not implement any interfaces, A cglib proxy is created.

Therefore, the solution is that if JDK dynamic proxy is used, an interface must be implemented for the target to be proxy (note that CTX is required. the Return Value of the getbean () method is received by the interface type). If you use the cglib force proxy, you must import the cglib package to the project and set the proxytargetclass attribute of beannameautoproxycreator to true.

Here, deviceservice implements the interface IDeviceservice.JDK dynamic proxy, so that (deviceservice) deviceservice forced conversion error (because the implementation IDThe eviceservice interface proxy class isDEviceservice subclass). Therefore, you need to useCglib enforces proxy. Add the following configuration in springcontext. xml:

 

<AOP: aspectj-autoproxy proxy-target-class = "true"/>