我正在尝试使用EMB中的Java api客户端连接到marklogic，如下所示。我在netbeans中创建了一个maven EJB Module项目，并将marklogic依赖项添加到pom中。
<dependency>
<groupId>com.marklogic</groupId>
<artifactId>java-client-api</artifactId>
<version>3.0.1</version>
</dependency>
package com.xx.yy;
import java.io.IOException;
import java.util.concurrent.atomic.AtomicLong;
import javax.ejb.ActivationConfigProperty;
import javax.ejb.MessageDriven;
import javax.jms.JMSException;
import javax.jms.Message;
import javax.jms.MessageListener;
import javax.jms.TextMessage;
import javax.xml.xpath.XPathExpressionException;
@MessageDriven(activationConfig = {
@ActivationConfigProperty(propertyName = "destinationType", propertyValue = "javax.jms.Topic"),
@ActivationConfigProperty(propertyName = "destinationLookup", propertyValue = "jms/MyTopic"),
@ActivationConfigProperty(propertyName = "subscriptionDurability", propertyValue = "Durable"),
@ActivationConfigProperty(propertyName = "clientId", propertyValue = "jms/MyTopic"),
@ActivationConfigProperty(propertyName = "subscriptionName", propertyValue = "jms/MyTopic")
})
public class CreateBlock implements MessageListener {
AtomicLong count = new AtomicLong(0);
public CreateBlock() {
}
@Override
public void onMessage(Message m){
long i;
try {
if (m instanceof TextMessage) {
i = count.incrementAndGet();
System.out.println("Reading message: " + m.getBody(String.class));
GenerateBlock.createblock(m.getBody(String.class));
} else {
System.err.println("Message is not a TextMessage");
}
} catch (JMSException e) {
System.err.println("JMSException in onMessage(): " + e.toString());
}
catch ( IOException e){
System.err.println("IOException in onMessage(): " + e.toString());
}
catch (XPathExpressionException e){
System.err.println("XPathExpressionException in onMessage(): " + e.toString());
}
}
}
执行以下,,,只是来自java api客户端食谱的一些代码，以确认我可以从数据库中读取
package com.xx.yy;
import java.io.IOException;
import javax.xml.xpath.XPathExpressionException;
import org.w3c.dom.Document;
import com.marklogic.client.DatabaseClient;
import com.marklogic.client.DatabaseClientFactory;
import com.marklogic.client.document.XMLDocumentManager;
import com.marklogic.client.DatabaseClientFactory.Authentication;
public class GenerateBlock {
public static void createblock(String docId) throws IOException, XPathExpressionException {
DatabaseClient client = DatabaseClientFactory.newClient(
"domain.com", 8012, "dbname", "admin", "password",
Authentication.valueOf("DIGEST"));
XMLDocumentManager docMgr = client.newXMLDocumentManager();
docMgr.setForestName("forestname");
// read the document content
Document document = docMgr.readAs(docId, Document.class);
// access the document content
String rootName = document.getDocumentElement().getTagName();
System.out.println("(Shortcut) Read " + docId + " content with the <" + rootName + "/> root element");
client.release();
}
}
但是当代码在收到JMS消息时执行时，会发生以下异常
**
Info: MQJMSRA_MR1101: run:Message returned & marked for routing to the DMQ
Warning: MDB00037: [StoneManBuilder:CreateBlock]: Message-driven bean invocation exception: [javax.ejb.EJBException]
Warning: javax.ejb.EJBException
javax.ejb.EJBException
at com.sun.ejb.containers.EJBContainerTransactionManager.processSystemException(EJBContainerTransactionManager.java:750)
at com.sun.ejb.containers.EJBContainerTransactionManager.completeNewTx(EJBContainerTransactionManager.java:700)
at com.sun.ejb.containers.EJBContainerTransactionManager.postInvokeTx(EJBContainerTransactionManager.java:505)
at com.sun.ejb.containers.BaseContainer.postInvokeTx(BaseContainer.java:4566)
at org.glassfish.ejb.mdb.MessageBeanContainer.afterMessageDeliveryInternal(MessageBeanContainer.java:1326)
at org.glassfish.ejb.mdb.MessageBeanContainer.afterMessageDelivery(MessageBeanContainer.java:1301)
at org.glassfish.ejb.mdb.MessageBeanListenerImpl.afterMessageDelivery(MessageBeanListenerImpl.java:86)
at com.sun.enterprise.connectors.inbound.MessageEndpointInvocationHandler.invoke(MessageEndpointInvocationHandler.java:143)
at com.sun.proxy.$Proxy348.afterDelivery(Unknown Source)
at com.sun.messaging.jms.ra.OnMessageRunner.run(OnMessageRunner.java:361)
at com.sun.enterprise.connectors.work.OneWork.doWork(OneWork.java:107)
at com.sun.corba.ee.impl.threadpool.ThreadPoolImpl$WorkerThread.performWork(ThreadPoolImpl.java:497)
at com.sun.corba.ee.impl.threadpool.ThreadPoolImpl$WorkerThread.run(ThreadPoolImpl.java:540)
Caused by: java.lang.NoClassDefFoundError: Could not initialize class com.marklogic.client.DatabaseClientFactory
at com.kode100.stonemanbuilder.GenerateBlock.createblock(GenerateBlock.java:31)
at com.kode100.stonemanbuilder.CreateBlock.onMessage(CreateBlock.java:45)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at org.glassfish.ejb.security.application.EJBSecurityManager.runMethod(EJBSecurityManager.java:1081)
at org.glassfish.ejb.security.application.EJBSecurityManager.invoke(EJBSecurityManager.java:1153)
at com.sun.ejb.containers.BaseContainer.invokeBeanMethod(BaseContainer.java:4786)
at com.sun.ejb.EjbInvocation.invokeBeanMethod(EjbInvocation.java:656)
at com.sun.ejb.containers.interceptors.AroundInvokeChainImpl.invokeNext(InterceptorManager.java:822)
at com.sun.ejb.EjbInvocation.proceed(EjbInvocation.java:608)
at org.jboss.weld.ejb.AbstractEJBRequestScopeActivationInterceptor.aroundInvoke(AbstractEJBRequestScopeActivationInterceptor.java:73)
at org.jboss.weld.ejb.SessionBeanInterceptor.aroundInvoke(SessionBeanInterceptor.java:52)
at sun.reflect.GeneratedMethodAccessor196.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at com.sun.ejb.containers.interceptors.AroundInvokeInterceptor.intercept(InterceptorManager.java:883)
at com.sun.ejb.containers.interceptors.AroundInvokeChainImpl.invokeNext(InterceptorManager.java:822)
at com.sun.ejb.containers.interceptors.InterceptorManager.intercept(InterceptorManager.java:369)
at com.sun.ejb.containers.BaseContainer.__intercept(BaseContainer.java:4758)
at com.sun.ejb.containers.BaseContainer.intercept(BaseContainer.java:4746)
at org.glassfish.ejb.mdb.MessageBeanContainer.deliverMessage(MessageBeanContainer.java:1219)
at org.glassfish.ejb.mdb.MessageBeanListenerImpl.deliverMessage(MessageBeanListenerImpl.java:81)
at com.sun.enterprise.connectors.inbound.MessageEndpointInvocationHandler.invoke(MessageEndpointInvocationHandler.java:171)
at com.sun.proxy.$Proxy348.onMessage(Unknown Source)
at com.sun.messaging.jms.ra.OnMessageRunner.run(OnMessageRunner.java:283)
... 3 more
**
我可以使用与将文件上传到数据库的JSF应用程序相同的连接代码和参数连接到数据库。然后它释放客户端并使用JMS调用上面的代码，以便最终对数据进行更多处理，读取和写入marklogic。
我是否应该使用不同类型的项目来使用JMS使用marklogic，或者我的代码是否有不正确的内容？
此致 康特
答案 0 :(得分：3)
鉴于核心错误是：
Caused by: java.lang.NoClassDefFoundError: Could not initialize class com.marklogic.client.DatabaseClientFactory
您可能遇到环境问题而不是代码问题 - 尤其是使MarkLogic jar可用于EJB类加载器的问题。
顺便说一下，在生产代码中，您需要创建一次客户端，并对同一主机上的所有请求重复使用它，而不是为每个请求创建一个新客户端。
每个食谱配方都是独立的，这就是为什么他们不共享同一个数据库客户端。
希望有帮助，