CDI 注入：java.lang.Class 无法转换为 java.lang.reflect.ParameterizedType
CDI Inject: java.lang.Class cannot be cast to java.lang.reflect.ParameterizedType
正在尝试创建 DAO 层但每次都出现以下异常
javax.ejb.EJBException: java.lang.ClassCastException: java.lang.Class cannot be cast to java.lang.reflect.ParameterizedType
我看过相关文章，发现我的结构按照定义是正确的，但我不确定为什么会出现此异常？
接口：
public interface GenericDao<T, PK> {
long countAll(/* Map<String, Object> params */);
void createAll(Collection<T> ts);
T create(T t);
摘要Class:
public abstract class GenericDaoImpl<T, PK> implements GenericDao<T, PK> {
@PersistenceContext(unitName = "IntegratorMasterdataDS")
protected EntityManager em;
private final Class<T> type;
public GenericDaoImpl() {
Type t = getClass().getGenericSuperclass();
ParameterizedType pt = (ParameterizedType) t;
type = (Class) pt.getActualTypeArguments()[0];
}
扩展接口：
public interface CustomerAgreementDao extends GenericDao<CustomerAgreement, Long>{
CustomerAgreement create(CustomerAgreement person);
扩展实施：
@Named("customerAgreementDao")
@ApplicationScoped
public class CustomerAgreementDaoImpl extends GenericDaoImpl<CustomerAgreement, Long> implements CustomerAgreementDao {
@Override
public CustomerAgreement create(CustomerAgreement customerAgreement) {
return (CustomerAgreement) create((CustomerAgreement) customerAgreement);
}
这是我从 Spring 代码复制而来的，它工作正常，没有任何问题。任何人都可以建议这是什么问题。我需要在某处添加另一个注释吗？
异常详情：
2019-11-29 11:21:00,523 ERROR [org.jboss.msc.service.fail] (ServerService Thread Pool -- 104) MSC000001: Failed to start service jboss.deployment.unit."Snow-1.1-SNAPSHOT.war".component.SnowPoller.START: org.jboss.msc.service.StartException in service jboss.deployment.unit."Snow-1.1-SNAPSHOT.war".component.SnowPoller.START: java.lang.IllegalStateException: WFLYEE0042: Failed to construct component instance
at org.jboss.as.ee.component.ComponentStartService.run(ComponentStartService.java:57)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at org.jboss.threads.ContextClassLoaderSavingRunnable.run(ContextClassLoaderSavingRunnable.java:35)
at org.jboss.threads.EnhancedQueueExecutor.safeRun(EnhancedQueueExecutor.java:1982)
at org.jboss.threads.EnhancedQueueExecutor$ThreadBody.doRunTask(EnhancedQueueExecutor.java:1486)
at org.jboss.threads.EnhancedQueueExecutor$ThreadBody.run(EnhancedQueueExecutor.java:1377)
at java.lang.Thread.run(Thread.java:745)
at org.jboss.threads.JBossThread.run(JBossThread.java:485)
Caused by: java.lang.IllegalStateException: WFLYEE0042: Failed to construct component instance
at org.jboss.as.ee.component.BasicComponent.constructComponentInstance(BasicComponent.java:163)
at org.jboss.as.ee.component.BasicComponent.constructComponentInstance(BasicComponent.java:134)
at org.jboss.as.ee.component.BasicComponent.createInstance(BasicComponent.java:88)
at org.jboss.as.ejb3.component.singleton.SingletonComponent.getComponentInstance(SingletonComponent.java:127)
at org.jboss.as.ejb3.component.singleton.SingletonComponent.start(SingletonComponent.java:141)
at org.jboss.as.ee.component.ComponentStartService.run(ComponentStartService.java:54)
... 8 more
Caused by: javax.ejb.EJBException: java.lang.ClassCastException: java.lang.Class cannot be cast to java.lang.reflect.ParameterizedType
at org.jboss.as.ejb3.tx.CMTTxInterceptor.invokeInOurTx(CMTTxInterceptor.java:246)
at org.jboss.as.ejb3.tx.CMTTxInterceptor.requiresNew(CMTTxInterceptor.java:388)
at org.jboss.as.ejb3.tx.LifecycleCMTTxInterceptor.processInvocation(LifecycleCMTTxInterceptor.java:68)
at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:422)
at org.jboss.as.weld.injection.WeldInjectionContextInterceptor.processInvocation(WeldInjectionContextInterceptor.java:43)
at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:422)
at org.jboss.as.ejb3.component.interceptors.CurrentInvocationContextInterceptor.processInvocation(CurrentInvocationContextInterceptor.java:41)
at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:422)
at org.jboss.as.ee.concurrent.ConcurrentContextInterceptor.processInvocation(ConcurrentContextInterceptor.java:45)
at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:422)
at org.jboss.invocation.ContextClassLoaderInterceptor.processInvocation(ContextClassLoaderInterceptor.java:60)
at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:422)
at org.jboss.as.ejb3.component.singleton.StartupCountDownInterceptor.processInvocation(StartupCountDownInterceptor.java:25)
at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:422)
at org.jboss.invocation.ChainedInterceptor.processInvocation(ChainedInterceptor.java:53)
at org.jboss.as.ee.component.BasicComponent.constructComponentInstance(BasicComponent.java:161)
... 13 more
Caused by: java.lang.ClassCastException: java.lang.Class cannot be cast to java.lang.reflect.ParameterizedType
at com.evry.integrator.snow.model.dao.impl.GenericDaoImpl.<init>(GenericDaoImpl.java:22)
at com.evry.integrator.snow.model.dao.impl.CustomerAgreementDaoImpl.<init>(CustomerAgreementDaoImpl.java:13)
at com.evry.integrator.snow.model.dao.impl.CustomerAgreementDaoImpl$Proxy$_$$_WeldClientProxy.<init>(Unknown Source)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
at java.lang.Class.newInstance(Class.java:442)
at org.jboss.weld.bean.proxy.DefaultProxyInstantiator.newInstance(DefaultProxyInstantiator.java:43)
at org.jboss.weld.bean.proxy.ProxyFactory.run(ProxyFactory.java:339)
at org.jboss.weld.bean.proxy.ProxyFactory.create(ProxyFactory.java:323)
at org.jboss.weld.bean.proxy.ClientProxyFactory.create(ClientProxyFactory.java:83)
at org.jboss.weld.bean.proxy.ClientProxyProvider.createClientProxy(ClientProxyProvider.java:205)
at org.jboss.weld.bean.proxy.ClientProxyProvider.createClientProxy(ClientProxyProvider.java:195)
at org.jboss.weld.bean.proxy.ClientProxyProvider.access0(ClientProxyProvider.java:44)
at org.jboss.weld.bean.proxy.ClientProxyProvider$CreateClientProxy.apply(ClientProxyProvider.java:52)
at org.jboss.weld.bean.proxy.ClientProxyProvider$CreateClientProxy.apply(ClientProxyProvider.java:48)
at org.jboss.weld.util.cache.ReentrantMapBackedComputingCache.lambda$null[=17=](ReentrantMapBackedComputingCache.java:55)
at org.jboss.weld.util.LazyValueHolder.computeValue(LazyValueHolder.java:32)
at org.jboss.weld.util.LazyValueHolder.get(LazyValueHolder.java:46)
at org.jboss.weld.util.cache.ReentrantMapBackedComputingCache.getValue(ReentrantMapBackedComputingCache.java:72)
at org.jboss.weld.util.cache.ReentrantMapBackedComputingCache.getCastValue(ReentrantMapBackedComputingCache.java:78)
at org.jboss.weld.bean.proxy.ClientProxyProvider.getClientProxy(ClientProxyProvider.java:229)
at org.jboss.weld.manager.BeanManagerImpl.getReference(BeanManagerImpl.java:688)
at org.jboss.weld.manager.BeanManagerImpl.getInjectableReference(BeanManagerImpl.java:794)
at org.jboss.weld.injection.FieldInjectionPoint.inject(FieldInjectionPoint.java:92)
at org.jboss.weld.util.Beans.injectBoundFields(Beans.java:336)
at org.jboss.weld.util.Beans.injectFieldsAndInitializers(Beans.java:347)
at org.jboss.weld.injection.producer.DefaultInjector.proceed(DefaultInjector.java:71)
at org.jboss.weld.injection.InjectionContextImpl.run(InjectionContextImpl.java:48)
at org.jboss.weld.injection.producer.DefaultInjector.inject(DefaultInjector.java:73)
at org.jboss.weld.module.ejb.DynamicInjectionPointInjector.inject(DynamicInjectionPointInjector.java:61)
at org.jboss.weld.module.ejb.SessionBeanInjectionTarget.inject(SessionBeanInjectionTarget.java:138)
at org.jboss.as.weld.injection.WeldInjectionContext.inject(WeldInjectionContext.java:39)
at org.jboss.as.weld.injection.WeldInjectionInterceptor.processInvocation(WeldInjectionInterceptor.java:51)
at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:422)
at org.jboss.as.ee.component.AroundConstructInterceptorFactory.processInvocation(AroundConstructInterceptorFactory.java:28)
at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:422)
at org.jboss.as.weld.injection.WeldInterceptorInjectionInterceptor.processInvocation(WeldInterceptorInjectionInterceptor.java:56)
at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:422)
at org.jboss.as.weld.interceptors.Jsr299BindingsCreateInterceptor.processInvocation(Jsr299BindingsCreateInterceptor.java:111)
at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:422)
at org.jboss.as.ee.component.NamespaceContextInterceptor.processInvocation(NamespaceContextInterceptor.java:50)
at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:422)
at org.jboss.as.ejb3.tx.CMTTxInterceptor.invokeInOurTx(CMTTxInterceptor.java:237)
... 28 more
我刚刚在 GenericDaoImpl 上添加了@SuppressWarnings({"unchecked", "rawtypes"})
错误消失了。
@SuppressWarnings({"unchecked", "rawtypes"})
public GenericDaoImpl() {
Type t = getClass().getGenericSuperclass();
ParameterizedType pt = (ParameterizedType) t;
type = (Class<T>) pt.getActualTypeArguments()[0];
}
但不知道为什么？我不确定这是否是这个问题的答案。
所以这只是一般分享。
注意：当我将 Class<T> 恢复为 Class 时它甚至可以正常工作
正在尝试创建 DAO 层但每次都出现以下异常
javax.ejb.EJBException: java.lang.ClassCastException: java.lang.Class cannot be cast to java.lang.reflect.ParameterizedType
我看过相关文章，发现我的结构按照定义是正确的，但我不确定为什么会出现此异常？
接口：
public interface GenericDao<T, PK> {
long countAll(/* Map<String, Object> params */);
void createAll(Collection<T> ts);
T create(T t);
摘要Class:
public abstract class GenericDaoImpl<T, PK> implements GenericDao<T, PK> {
@PersistenceContext(unitName = "IntegratorMasterdataDS")
protected EntityManager em;
private final Class<T> type;
public GenericDaoImpl() {
Type t = getClass().getGenericSuperclass();
ParameterizedType pt = (ParameterizedType) t;
type = (Class) pt.getActualTypeArguments()[0];
}
扩展接口：
public interface CustomerAgreementDao extends GenericDao<CustomerAgreement, Long>{
CustomerAgreement create(CustomerAgreement person);
扩展实施：
@Named("customerAgreementDao")
@ApplicationScoped
public class CustomerAgreementDaoImpl extends GenericDaoImpl<CustomerAgreement, Long> implements CustomerAgreementDao {
@Override
public CustomerAgreement create(CustomerAgreement customerAgreement) {
return (CustomerAgreement) create((CustomerAgreement) customerAgreement);
}
这是我从 Spring 代码复制而来的，它工作正常，没有任何问题。任何人都可以建议这是什么问题。我需要在某处添加另一个注释吗？
异常详情：
2019-11-29 11:21:00,523 ERROR [org.jboss.msc.service.fail] (ServerService Thread Pool -- 104) MSC000001: Failed to start service jboss.deployment.unit."Snow-1.1-SNAPSHOT.war".component.SnowPoller.START: org.jboss.msc.service.StartException in service jboss.deployment.unit."Snow-1.1-SNAPSHOT.war".component.SnowPoller.START: java.lang.IllegalStateException: WFLYEE0042: Failed to construct component instance
at org.jboss.as.ee.component.ComponentStartService.run(ComponentStartService.java:57)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at org.jboss.threads.ContextClassLoaderSavingRunnable.run(ContextClassLoaderSavingRunnable.java:35)
at org.jboss.threads.EnhancedQueueExecutor.safeRun(EnhancedQueueExecutor.java:1982)
at org.jboss.threads.EnhancedQueueExecutor$ThreadBody.doRunTask(EnhancedQueueExecutor.java:1486)
at org.jboss.threads.EnhancedQueueExecutor$ThreadBody.run(EnhancedQueueExecutor.java:1377)
at java.lang.Thread.run(Thread.java:745)
at org.jboss.threads.JBossThread.run(JBossThread.java:485)
Caused by: java.lang.IllegalStateException: WFLYEE0042: Failed to construct component instance
at org.jboss.as.ee.component.BasicComponent.constructComponentInstance(BasicComponent.java:163)
at org.jboss.as.ee.component.BasicComponent.constructComponentInstance(BasicComponent.java:134)
at org.jboss.as.ee.component.BasicComponent.createInstance(BasicComponent.java:88)
at org.jboss.as.ejb3.component.singleton.SingletonComponent.getComponentInstance(SingletonComponent.java:127)
at org.jboss.as.ejb3.component.singleton.SingletonComponent.start(SingletonComponent.java:141)
at org.jboss.as.ee.component.ComponentStartService.run(ComponentStartService.java:54)
... 8 more
Caused by: javax.ejb.EJBException: java.lang.ClassCastException: java.lang.Class cannot be cast to java.lang.reflect.ParameterizedType
at org.jboss.as.ejb3.tx.CMTTxInterceptor.invokeInOurTx(CMTTxInterceptor.java:246)
at org.jboss.as.ejb3.tx.CMTTxInterceptor.requiresNew(CMTTxInterceptor.java:388)
at org.jboss.as.ejb3.tx.LifecycleCMTTxInterceptor.processInvocation(LifecycleCMTTxInterceptor.java:68)
at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:422)
at org.jboss.as.weld.injection.WeldInjectionContextInterceptor.processInvocation(WeldInjectionContextInterceptor.java:43)
at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:422)
at org.jboss.as.ejb3.component.interceptors.CurrentInvocationContextInterceptor.processInvocation(CurrentInvocationContextInterceptor.java:41)
at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:422)
at org.jboss.as.ee.concurrent.ConcurrentContextInterceptor.processInvocation(ConcurrentContextInterceptor.java:45)
at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:422)
at org.jboss.invocation.ContextClassLoaderInterceptor.processInvocation(ContextClassLoaderInterceptor.java:60)
at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:422)
at org.jboss.as.ejb3.component.singleton.StartupCountDownInterceptor.processInvocation(StartupCountDownInterceptor.java:25)
at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:422)
at org.jboss.invocation.ChainedInterceptor.processInvocation(ChainedInterceptor.java:53)
at org.jboss.as.ee.component.BasicComponent.constructComponentInstance(BasicComponent.java:161)
... 13 more
Caused by: java.lang.ClassCastException: java.lang.Class cannot be cast to java.lang.reflect.ParameterizedType
at com.evry.integrator.snow.model.dao.impl.GenericDaoImpl.<init>(GenericDaoImpl.java:22)
at com.evry.integrator.snow.model.dao.impl.CustomerAgreementDaoImpl.<init>(CustomerAgreementDaoImpl.java:13)
at com.evry.integrator.snow.model.dao.impl.CustomerAgreementDaoImpl$Proxy$_$$_WeldClientProxy.<init>(Unknown Source)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
at java.lang.Class.newInstance(Class.java:442)
at org.jboss.weld.bean.proxy.DefaultProxyInstantiator.newInstance(DefaultProxyInstantiator.java:43)
at org.jboss.weld.bean.proxy.ProxyFactory.run(ProxyFactory.java:339)
at org.jboss.weld.bean.proxy.ProxyFactory.create(ProxyFactory.java:323)
at org.jboss.weld.bean.proxy.ClientProxyFactory.create(ClientProxyFactory.java:83)
at org.jboss.weld.bean.proxy.ClientProxyProvider.createClientProxy(ClientProxyProvider.java:205)
at org.jboss.weld.bean.proxy.ClientProxyProvider.createClientProxy(ClientProxyProvider.java:195)
at org.jboss.weld.bean.proxy.ClientProxyProvider.access0(ClientProxyProvider.java:44)
at org.jboss.weld.bean.proxy.ClientProxyProvider$CreateClientProxy.apply(ClientProxyProvider.java:52)
at org.jboss.weld.bean.proxy.ClientProxyProvider$CreateClientProxy.apply(ClientProxyProvider.java:48)
at org.jboss.weld.util.cache.ReentrantMapBackedComputingCache.lambda$null[=17=](ReentrantMapBackedComputingCache.java:55)
at org.jboss.weld.util.LazyValueHolder.computeValue(LazyValueHolder.java:32)
at org.jboss.weld.util.LazyValueHolder.get(LazyValueHolder.java:46)
at org.jboss.weld.util.cache.ReentrantMapBackedComputingCache.getValue(ReentrantMapBackedComputingCache.java:72)
at org.jboss.weld.util.cache.ReentrantMapBackedComputingCache.getCastValue(ReentrantMapBackedComputingCache.java:78)
at org.jboss.weld.bean.proxy.ClientProxyProvider.getClientProxy(ClientProxyProvider.java:229)
at org.jboss.weld.manager.BeanManagerImpl.getReference(BeanManagerImpl.java:688)
at org.jboss.weld.manager.BeanManagerImpl.getInjectableReference(BeanManagerImpl.java:794)
at org.jboss.weld.injection.FieldInjectionPoint.inject(FieldInjectionPoint.java:92)
at org.jboss.weld.util.Beans.injectBoundFields(Beans.java:336)
at org.jboss.weld.util.Beans.injectFieldsAndInitializers(Beans.java:347)
at org.jboss.weld.injection.producer.DefaultInjector.proceed(DefaultInjector.java:71)
at org.jboss.weld.injection.InjectionContextImpl.run(InjectionContextImpl.java:48)
at org.jboss.weld.injection.producer.DefaultInjector.inject(DefaultInjector.java:73)
at org.jboss.weld.module.ejb.DynamicInjectionPointInjector.inject(DynamicInjectionPointInjector.java:61)
at org.jboss.weld.module.ejb.SessionBeanInjectionTarget.inject(SessionBeanInjectionTarget.java:138)
at org.jboss.as.weld.injection.WeldInjectionContext.inject(WeldInjectionContext.java:39)
at org.jboss.as.weld.injection.WeldInjectionInterceptor.processInvocation(WeldInjectionInterceptor.java:51)
at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:422)
at org.jboss.as.ee.component.AroundConstructInterceptorFactory.processInvocation(AroundConstructInterceptorFactory.java:28)
at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:422)
at org.jboss.as.weld.injection.WeldInterceptorInjectionInterceptor.processInvocation(WeldInterceptorInjectionInterceptor.java:56)
at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:422)
at org.jboss.as.weld.interceptors.Jsr299BindingsCreateInterceptor.processInvocation(Jsr299BindingsCreateInterceptor.java:111)
at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:422)
at org.jboss.as.ee.component.NamespaceContextInterceptor.processInvocation(NamespaceContextInterceptor.java:50)
at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:422)
at org.jboss.as.ejb3.tx.CMTTxInterceptor.invokeInOurTx(CMTTxInterceptor.java:237)
... 28 more
我刚刚在 GenericDaoImpl 上添加了@SuppressWarnings({"unchecked", "rawtypes"}) 错误消失了。
@SuppressWarnings({"unchecked", "rawtypes"})
public GenericDaoImpl() {
Type t = getClass().getGenericSuperclass();
ParameterizedType pt = (ParameterizedType) t;
type = (Class<T>) pt.getActualTypeArguments()[0];
}
但不知道为什么？我不确定这是否是这个问题的答案。 所以这只是一般分享。
注意：当我将 Class<T> 恢复为 Class 时它甚至可以正常工作