Concurrency Exception

[Farouk Elabady]

Hello Alessandro

Currently I am trying to register multiple users concurrently from my web application using JMapper as my mapping framework between the data model and the entity , but i get the following exception especially when I run the app for the first time 

17:24:03.201 [http-nio-8080-exec-4] ERROR com.googlecode.jmapper.JMapper - CannotCompileException: by java.lang.LinkageError: loader (instance of  org/apache/catalina/loader/WebappClassLoader): attempted  duplicate class definition for name: "netonecardthymeleaftemplatedataaccessentitiesUsernetonecardthymeleaftemplatebussinessdatamodelRegisterModel"

Feb 25, 2016 5:24:03 PM org.apache.catalina.core.StandardWrapperValve invoke

SEVERE: Servlet.service() for servlet [dispatcher] in context with path [/ThymeleafTemplate] threw exception [Request processing failed; nested exception is com.googlecode.jmapper.exceptions.JMapperException: javassist.CannotCompileException: by java.lang.LinkageError: loader (instance of  org/apache/catalina/loader/WebappClassLoader): attempted  duplicate class definition for name: "netonecardthymeleaftemplatedataaccessentitiesUsernetonecardthymeleaftemplatebussinessdatamodelRegisterModel"] with root cause

java.lang.LinkageError: loader (instance of  org/apache/catalina/loader/WebappClassLoader): attempted  duplicate class definition for name: "netonecardthymeleaftemplatedataaccessentitiesUsernetonecardthymeleaftemplatebussinessdatamodelRegisterModel"

at java.lang.ClassLoader.defineClass1(Native Method)

at java.lang.ClassLoader.defineClass(ClassLoader.java:760)

at java.lang.ClassLoader.defineClass(ClassLoader.java:642)

at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)

at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)

at java.lang.reflect.Method.invoke(Method.java:497)

at javassist.ClassPool.toClass2(ClassPool.java:1112)

at javassist.ClassPool.toClass(ClassPool.java:1093)

at javassist.ClassPool.toClass(ClassPool.java:1042)

at javassist.ClassPool.toClass(ClassPool.java:1000)

at javassist.CtClass.toClass(CtClass.java:1224)

at com.googlecode.jmapper.generation.JavassistGenerator.generate(JavassistGenerator.java:77)

at com.googlecode.jmapper.generation.MapperGenerator.generateMapperClass(MapperGenerator.java:76)

at com.googlecode.jmapper.generation.MapperBuilder.generate(MapperBuilder.java:88)

at com.googlecode.jmapper.JMapper.createMapper(JMapper.java:425)

at com.googlecode.jmapper.JMapper.<init>(JMapper.java:413)

at com.googlecode.jmapper.JMapper.<init>(JMapper.java:358)

at net.onecard.thymeleaftemplate.util.DefaultObjectMapper.getJmapper(DefaultObjectMapper.java:52)

at net.onecard.thymeleaftemplate.util.DefaultObjectMapper.objectTransform(DefaultObjectMapper.java:23)

at net.onecard.thymeleaftemplate.bussiness.services.JpaUserService.register(JpaUserService.java:34)

at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)

at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)

at java.lang.reflect.Method.invoke(Method.java:497)

at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:302)

at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:190)

at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:157)

at org.springframework.transaction.interceptor.TransactionInterceptor$1.proceedWithInvocation(TransactionInterceptor.java:99)

at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:281)

at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:96)

at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)

at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:208)

at com.sun.proxy.$Proxy195.register(Unknown Source)

at net.onecard.thymeleaftemplate.bussiness.facade.DefaultServiceFacade.register(DefaultServiceFacade.java:32)

at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)

at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)

at java.lang.reflect.Method.invoke(Method.java:497)

at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:302)

at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:190)

at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:157)

at org.springframework.aop.framework.adapter.MethodBeforeAdviceInterceptor.invoke(MethodBeforeAdviceInterceptor.java:52)

at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)

at org.springframework.aop.framework.adapter.MethodBeforeAdviceInterceptor.invoke(MethodBeforeAdviceInterceptor.java:52)

at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)

at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:92)

at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)

at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:208)

at com.sun.proxy.$Proxy197.register(Unknown Source)

at net.onecard.thymeleaftemplate.integration.rest.DefaultRestApi.register(DefaultRestApi.java:28)

at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)

at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)

at java.lang.reflect.Method.invoke(Method.java:497)

at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:222)

at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:137)

at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:110)

at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:814)

at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:737)

at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:85)

at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:959)

at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:893)

at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:970)

at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:861)

at javax.servlet.http.HttpServlet.service(HttpServlet.java:622)

at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:846)

at javax.servlet.http.HttpServlet.service(HttpServlet.java:729)

at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:292)

at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)

at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)

at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:240)

at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)

at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:316)

at org.springframework.security.web.access.intercept.FilterSecurityInterceptor.invoke(FilterSecurityInterceptor.java:126)

at org.springframework.security.web.access.intercept.FilterSecurityInterceptor.doFilter(FilterSecurityInterceptor.java:90)

at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:330)

at org.springframework.security.web.access.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:114)

at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:330)

at org.springframework.security.web.session.SessionManagementFilter.doFilter(SessionManagementFilter.java:122)

at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:330)

at org.springframework.security.web.authentication.AnonymousAuthenticationFilter.doFilter(AnonymousAuthenticationFilter.java:111)

at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:330)

at org.springframework.security.web.servletapi.SecurityContextHolderAwareRequestFilter.doFilter(SecurityContextHolderAwareRequestFilter.java:169)

at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:330)

at org.springframework.security.web.savedrequest.RequestCacheAwareFilter.doFilter(RequestCacheAwareFilter.java:48)

at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:330)

at org.springframework.security.web.authentication.AbstractAuthenticationProcessingFilter.doFilter(AbstractAuthenticationProcessingFilter.java:205)

at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:330)

at org.springframework.security.web.authentication.logout.LogoutFilter.doFilter(LogoutFilter.java:120)

at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:330)

at org.springframework.security.web.csrf.CsrfFilter.doFilterInternal(CsrfFilter.java:96)

at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)

at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:330)

at org.springframework.security.web.header.HeaderWriterFilter.doFilterInternal(HeaderWriterFilter.java:64)

at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)

at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:330)

at org.springframework.security.web.context.SecurityContextPersistenceFilter.doFilter(SecurityContextPersistenceFilter.java:91)

at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:330)

at org.springframework.security.web.context.request.async.WebAsyncManagerIntegrationFilter.doFilterInternal(WebAsyncManagerIntegrationFilter.java:53)

at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)

at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:330)

at org.springframework.security.web.FilterChainProxy.doFilterInternal(FilterChainProxy.java:213)

at org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:176)

at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:346)

at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:262)

at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:240)

at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)

at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:212)

at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:106)

at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502)

at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:141)

at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79)

at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:616)

at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88)

at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:522)

at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1095)

at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:672)

at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1500)

at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1456)

at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)

at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)

at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)

at java.lang.Thread.run(Thread.java:745)

and the sample code posted below 

Enter code here...

@Component

public class DefaultObjectMapper implements ObjectMapper {

private static final Map<String, JMapper<?,?>> map =  new ConcurrentHashMap<>();

@Override

public <D,S> D objectTransform(final Class<D> destination,

S sourceObject,final Class<S> source) {

JMapper<D, S> mapper =  (JMapper<D, S>) getJmapper(destination,source);//new JMapper<>(destination, source);

return mapper.getDestination(sourceObject);

}

@Override

public <D, S> Collection<D> collectionTransform(

final Class<D> destination, Collection<S> entity, final Class<S> source) {

JMapper<D, S> mapper = (JMapper<D, S>) getJmapper(destination,source);//new JMapper<>(destination, source);

Collection<D> results = entity.stream().map((s) -> mapper.getDestination(s))

.collect(Collectors.toCollection(ArrayList::new));

return results;

}

@Override

public <D, S> Page<D> PageTransform(Class<D> destinationClass, Page<S> entityIterable,

Class<S> source) {

JMapper<D, S> mapper = (JMapper<D, S>) getJmapper(destinationClass,source);//new JMapper<>(destinationClass, source);

Page<D> results = entityIterable.map((s) -> mapper.getDestination(s));

return results;

}

private <D,S> JMapper<?, ?> getJmapper(final Class<D> destination,final Class<S> source) {

String className = destination.getCanonicalName();

System.out.println(className);

if(map.get(className) != null) {

System.out.println("First store : ");

return map.get(className);

} else {

System.out.println("get from here");

JMapper<D, S> mapper = new JMapper<>(destination, source);

map.put(className, mapper);

return mapper;

}

}

}

@Service

public class JpaUserService  implements UserService {

@Autowired

private ObjectMapper mapper;

@Autowired

private UserRepository userRepository;

@Autowired

private PasswordEncoder passwordEncoder;

@Transactional

public boolean register(RegisterModel registerModel) {

Instant start =  Instant.now();

User user = mapper.objectTransform(User.class, registerModel, RegisterModel.class);

Instant finish =  Instant.now();

System.out.println("Mapping time : " + Duration.between(start, finish).toString());

user.setPassword(passwordEncoder.encode(user.getPassword()));

start =  Instant.now();

start =  Instant.now();

System.out.println("Start : " + start.toString());

user = userRepository.save(user);

finish =  Instant.now();

System.out.println("Start : " + finish.toString());

System.out.println("Saving time : " + Duration.between(start, finish).toString());

System.out.println("User ID : " + user.getId());

return true;

}

}

thank for your help n advance

Best regards

Farouk Elabady

[Alessandro Vurro]

which version of JMapper are you using?

[Farouk Elabady]

Currently I am using version 1.4.2, what I found so far also is that when I use tend to send a lot of requests calling the same 

JMapper<D, S> mapper = new JMapper<>(destination, source); several times , it  tries to create class definition multiple times giving this duplication error , I currently solved this with some caching and using a map and the synchronized keyword in java.

[Alessandro Vurro]

Upgrade to 1.5.0, this version solve this issue