我正在学习Groovy语言以及将其与CDI集成的可能性。
在java类路径中，a有一个名为Product的接口。我创建了一个返回Product类型的CDI Producer方法。
在另一个班级，我执行Product的注入，来自CDI Producer Method。
在classpath之外，我用一个简单的groovy类编写了一个groovy脚本，它实现了Product接口。
在CDI Producer Method中，我使用GroovyScriptEngine从脚本中检索Class对象，以创建CDI Bean。
我正在使用
（认为这个问题只与CDI和Groovy的Weld实现有关）
第一次一切正常。可以在JSF页面中使用创建的bean，单击按钮并在服务器端执行操作，并在浏览器上刷新页面。 groovy脚本类上的所有声明的方法和字段都可以访问并与JSF页面一起使用。 CDI容器也执行@PostConstruct的调用。可以多次调用CDI Producer Method，并且一切正常。
如上所述，第一次一切正常。但是当groovy脚本发生变化时，会抛出ClassCastException。
有人可以帮我解决这个问题吗？这是一个Weld / Groovy问题，还是根本不可能？
Product界面：
package test;
/**
*
* @author Welyab
*/
@ProductMethodIntercetor
public interface Product {
public void a();
public void b();
}
实现Product接口的groovy脚本：
package test
class ProductImplWithGroovy implements test.Product {
@javax.annotation.PostConstruct
def void init(){
println "call init()"
}
def void a(){
println "call a()";
}
def void b(){
println "call b()";
}
def void c(){
println "call c()";
}
}
生产者类/方法：
package test;
import groovy.util.GroovyScriptEngine;
import java.io.File;
import java.io.IOException;
import java.lang.annotation.Annotation;
import java.lang.reflect.Type;
import java.net.URL;
import java.util.Collections;
import java.util.HashSet;
import java.util.Set;
import javax.enterprise.context.ApplicationScoped;
import javax.enterprise.context.spi.CreationalContext;
import javax.enterprise.inject.Any;
import javax.enterprise.inject.Default;
import javax.enterprise.inject.Produces;
import javax.enterprise.inject.spi.AnnotatedType;
import javax.enterprise.inject.spi.Bean;
import javax.enterprise.inject.spi.BeanManager;
import javax.enterprise.inject.spi.CDI;
import javax.enterprise.inject.spi.InjectionTarget;
import javax.enterprise.util.AnnotationLiteral;
/**
*
* @author Welyab
*/
public class ProductsTest {
private static GroovyScriptEngine se;
static {
try {
se = new GroovyScriptEngine(new URL[]{
new File("c:/users/welyab/desktop").toURI().toURL()
});
}
catch (IOException ex) {
ex.printStackTrace();
}
}
@Produces
@ProductProducer
public Product criarProduto() {
BeanManager bm = CDI.current().getBeanManager();
final Class klazz;
try {
klazz = se.loadScriptByName("script_test.groovy");
}
catch (Exception ex) {
throw new RuntimeException(ex);
}
Class finalKlazz = klazz;
AnnotatedType annotatedType = bm.createAnnotatedType(finalKlazz);
InjectionTarget injectionTarget = bm.createInjectionTarget(annotatedType);
Bean bean = new Bean() {
@Override
public Class getBeanClass() {
return finalKlazz;
}
@Override
public Set getInjectionPoints() {
return injectionTarget.getInjectionPoints();
}
@Override
public boolean isNullable() {
return false;
}
@Override
public Object create(CreationalContext creationalContext) {
Object instance = injectionTarget.produce(creationalContext);
injectionTarget.inject(instance, creationalContext);
injectionTarget.postConstruct(instance);
return instance;
}
@Override
public void destroy(Object instance, CreationalContext creationalContext) {
injectionTarget.preDestroy(instance);
injectionTarget.dispose(instance);
creationalContext.release();
}
@Override
public Set<?> getTypes() {
Set<Type> types = new HashSet<>();
types.add(finalKlazz);
types.add(Product.class);
types.add(Object.class);
return types;
}
@Override
public Set getQualifiers() {
Set<Annotation> qualifiers = new HashSet<Annotation>();
qualifiers.add(new AnnotationLiteral<Default>() {
});
qualifiers.add(new AnnotationLiteral<Any>() {
});
return qualifiers;
}
@Override
public Class getScope() {
return ApplicationScoped.class;
}
@Override
public String getName() {
return "product";
}
@Override
public Set getStereotypes() {
return Collections.emptySet();
}
@Override
public boolean isAlternative() {
return false;
}
};
CreationalContext ctx = bm.createCreationalContext(bean);
Product produto = (Product) bm.getReference(bean, finalKlazz, ctx);
return produto;
}
}
bean到JSF页面：
package test;
import javax.enterprise.context.RequestScoped;
import javax.inject.Inject;
import javax.inject.Named;
/**
*
* @author Welyab
*/
@Named
@RequestScoped
public class TestBean {
@Inject
@ProductProducer
private Product product;
public Product getProduct() {
return product;
}
}
使用bean的JSF页面的简单片段。
<ui:composition xmlns="http://www.w3.org/1999/xhtml"
xmlns:ui="http://xmlns.jcp.org/jsf/facelets"
template="/install/ayszu-template.xhtml"
xmlns:p="http://primefaces.org/ui"
xmlns:jsf="http://xmlns.jcp.org/jsf"
xmlns:h="http://xmlns.jcp.org/jsf/html">
<ui:define name="body">
<form jsf:id="form" >
<h:commandButton value="a" action="#{testBean.product.a}" />
<h:commandButton value="b" action="#{testBean.product.b}" />
<h:commandButton value="c" action="#{testBean.product.c}" />
</form>
</ui:define>
</ui:composition>
带有错误的堆栈跟踪[所有异常看起来都是由类转换异常引起的]
30-Dec-2014 18:59:37.944 WARNING [http-nio-8082-exec-24] com.sun.faces.lifecycle.InvokeApplicationPhase.execute #{testBean.product.c}: java.lang.ClassCastException: test.ProductImplWithGroovy cannot be cast to test.ProductImplWithGroovy
javax.faces.FacesException: #{testBean.product.c}: java.lang.ClassCastException: test.ProductImplWithGroovy cannot be cast to test.ProductImplWithGroovy
at com.sun.faces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:118)
at javax.faces.component.UICommand.broadcast(UICommand.java:315)
call init()
at javax.faces.component.UIViewRoot.broadcastEvents(UIViewRoot.java:790)
at javax.faces.component.UIViewRoot.processApplication(UIViewRoot.java:1282)
at com.sun.faces.lifecycle.InvokeApplicationPhase.execute(InvokeApplicationPhase.java:81)
at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101)
at com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:198)
at javax.faces.webapp.FacesServlet.service(FacesServlet.java:646)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:301)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.ocpsoft.rewrite.servlet.RewriteFilter.doFilter(RewriteFilter.java:226)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at com.welyab.ayszu.core.MainFilter.doFilter(MainFilter.java:72)
at com.welyab.ayszu.core.MainFilter.doFilter(MainFilter.java:67)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:219)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:106)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:503)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:136)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:74)
at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:610)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:516)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1015)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:652)
at org.apache.coyote.http11.Http11NioProtocol$Http11ConnectionHandler.process(Http11NioProtocol.java:222)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1575)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1533)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)
Caused by: javax.faces.el.EvaluationException: java.lang.ClassCastException: test.ProductImplWithGroovy cannot be cast to test.ProductImplWithGroovy
at javax.faces.component.MethodBindingMethodExpressionAdapter.invoke(MethodBindingMethodExpressionAdapter.java:101)
at com.sun.faces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:102)
... 35 more
Caused by: java.lang.ClassCastException: test.ProductImplWithGroovy cannot be cast to test.ProductImplWithGroovy
at test.ProductImplWithGroovy$Proxy$_$$_WeldClientProxy.c(Unknown Source)
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:483)
at com.sun.el.parser.AstValue.invoke(AstValue.java:275)
at com.sun.el.MethodExpressionImpl.invoke(MethodExpressionImpl.java:304)
at org.jboss.weld.util.el.ForwardingMethodExpression.invoke(ForwardingMethodExpression.java:40)
at org.jboss.weld.el.WeldMethodExpression.invoke(WeldMethodExpression.java:50)
at com.sun.faces.facelets.el.TagMethodExpression.invoke(TagMethodExpression.java:105)
at javax.faces.component.MethodBindingMethodExpressionAdapter.invoke(MethodBindingMethodExpressionAdapter.java:87)
... 36 more
30-Dec-2014 18:59:38.182 FATAL [http-nio-8082-exec-24] com.sun.faces.context.ExceptionHandlerImpl.log JSF1073: javax.faces.FacesException obtido durante o processamento de INVOKE_APPLICATION 5: UIComponent-ClientId=, Message=#{testBean.product.c}: java.lang.ClassCastException: test.ProductImplWithGroovy cannot be cast to test.ProductImplWithGroovy
30-Dec-2014 18:59:38.191 FATAL [http-nio-8082-exec-24] com.sun.faces.context.ExceptionHandlerImpl.log #{testBean.product.c}: java.lang.ClassCastException: test.ProductImplWithGroovy cannot be cast to test.ProductImplWithGroovy
javax.faces.FacesException: #{testBean.product.c}: java.lang.ClassCastException: test.ProductImplWithGroovy cannot be cast to test.ProductImplWithGroovy
at com.sun.faces.lifecycle.InvokeApplicationPhase.execute(InvokeApplicationPhase.java:89)
at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101)
at com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:198)
at javax.faces.webapp.FacesServlet.service(FacesServlet.java:646)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:301)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.ocpsoft.rewrite.servlet.RewriteFilter.doFilter(RewriteFilter.java:226)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at com.welyab.ayszu.core.MainFilter.doFilter(MainFilter.java:72)
at com.welyab.ayszu.core.MainFilter.doFilter(MainFilter.java:67)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:219)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:106)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:503)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:136)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:74)
at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:610)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:516)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1015)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:652)
at org.apache.coyote.http11.Http11NioProtocol$Http11ConnectionHandler.process(Http11NioProtocol.java:222)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1575)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1533)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)
Caused by: javax.faces.FacesException: #{testBean.product.c}: java.lang.ClassCastException: test.ProductImplWithGroovy cannot be cast to test.ProductImplWithGroovy
at com.sun.faces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:118)
at javax.faces.component.UICommand.broadcast(UICommand.java:315)
at javax.faces.component.UIViewRoot.broadcastEvents(UIViewRoot.java:790)
at javax.faces.component.UIViewRoot.processApplication(UIViewRoot.java:1282)
at com.sun.faces.lifecycle.InvokeApplicationPhase.execute(InvokeApplicationPhase.java:81)
... 31 more
Caused by: javax.faces.el.EvaluationException: java.lang.ClassCastException: test.ProductImplWithGroovy cannot be cast to test.ProductImplWithGroovy
at javax.faces.component.MethodBindingMethodExpressionAdapter.invoke(MethodBindingMethodExpressionAdapter.java:101)
at com.sun.faces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:102)
... 35 more
Caused by: java.lang.ClassCastException: test.ProductImplWithGroovy cannot be cast to test.ProductImplWithGroovy
at test.ProductImplWithGroovy$Proxy$_$$_WeldClientProxy.c(Unknown Source)
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:483)
at com.sun.el.parser.AstValue.invoke(AstValue.java:275)
at com.sun.el.MethodExpressionImpl.invoke(MethodExpressionImpl.java:304)
at org.jboss.weld.util.el.ForwardingMethodExpression.invoke(ForwardingMethodExpression.java:40)
at org.jboss.weld.el.WeldMethodExpression.invoke(WeldMethodExpression.java:50)
at com.sun.faces.facelets.el.TagMethodExpression.invoke(TagMethodExpression.java:105)
at javax.faces.component.MethodBindingMethodExpressionAdapter.invoke(MethodBindingMethodExpressionAdapter.java:87)
... 36 more