【发布时间】：2017-11-29 00:40:20
【问题描述】：
我们目前正在从 Tomcat 迁移到 Wildfly 10 服务器。我们喜欢利用 Java EE 服务器。目前我们在数据源方面存在一些问题。我们已经在 Wildfly 上部署了 JDBC 驱动程序并设置了数据源。 这很有效，但我们喜欢使用 DatabaseQueryNotification (Oracle) 来处理数据库端事件。
现在我遇到的问题：
当我将驱动程序与我的 war（另外）打包时，由于 T4Connection 和 OracleConnection 不匹配，我得到了 ClassCastException。因此，我从我的 War (maven -> scope: provided) 中删除了 JDBC-Driver。但是现在我的应用程序在部署时失败了，因为 NoClassDefFound（请参阅下面的 Stacktrace）。
如何确保应用程序可以找到 JDBC 驱动程序？
Java 代码段：
public class DBListener implements IDBListener, Runnable, DatabaseChangeListener, IPropertyListener, Serializable {
@Resource(lookup = "java:/PlsDS")
private DataSource dataSource;
...
public void connectToDB(){
Connection tmpCon = dataSource.getConnection();
connection = (OracleConnection) tmpCon.getMetaData().getConnection();
...
}
}
堆栈跟踪：
14:32:59,869 WARN [org.jboss.modules] (MSC service thread 1-7) Failed to define class de.istec.pls.client.db.listener.DBListener in Module "deployment.client.pls-sc-1.0.0-SNAPSHOT.war:main" from Service Module Loader: java.lang.NoClassDefFoundError: Failed to link de/istec/pls/client/db/listener/DBListener (Module "deployment.client.pls-sc-1.0.0-SNAPSHOT.war:main" from Service Module Loader): oracle/jdbc/dcn/DatabaseChangeListener
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:422)
at org.jboss.modules.ModuleClassLoader.defineClass(ModuleClassLoader.java:446)
at org.jboss.modules.ModuleClassLoader.loadClassLocal(ModuleClassLoader.java:274)
at org.jboss.modules.ModuleClassLoader$1.loadClassLocal(ModuleClassLoader.java:78)
at org.jboss.modules.Module.loadModuleClass(Module.java:606)
at org.jboss.modules.ModuleClassLoader.findClass(ModuleClassLoader.java:190)
at org.jboss.modules.ConcurrentClassLoader.performLoadClassUnchecked(ConcurrentClassLoader.java:363)
at org.jboss.modules.ConcurrentClassLoader.performLoadClass(ConcurrentClassLoader.java:351)
at org.jboss.modules.ConcurrentClassLoader.loadClass(ConcurrentClassLoader.java:93)
at org.wildfly.extension.undertow.deployment.ServletContainerInitializerDeploymentProcessor.loadClassInfoSet(ServletContainerInitializerDeploymentProcessor.java:259)
at org.wildfly.extension.undertow.deployment.ServletContainerInitializerDeploymentProcessor.deploy(ServletContainerInitializerDeploymentProcessor.java:169)
at org.jboss.as.server.deployment.DeploymentUnitPhaseService.start(DeploymentUnitPhaseService.java:147)
at org.jboss.msc.service.ServiceControllerImpl$StartTask.startService(ServiceControllerImpl.java:1948)
at org.jboss.msc.service.ServiceControllerImpl$StartTask.run(ServiceControllerImpl.java:1881)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)
14:32:59,871 ERROR [org.jboss.msc.service.fail] (MSC service thread 1-7) MSC000001: Failed to start service jboss.deployment.unit."client.pls-sc-1.0.0-SNAPSHOT.war".INSTALL: org.jboss.msc.service.StartException in service jboss.deployment.unit."client.pls-sc-1.0.0-SNAPSHOT.war".INSTALL: WFLYSRV0153: Failed to process phase INSTALL of deployment "client.pls-sc-1.0.0-SNAPSHOT.war"
at org.jboss.as.server.deployment.DeploymentUnitPhaseService.start(DeploymentUnitPhaseService.java:154)
at org.jboss.msc.service.ServiceControllerImpl$StartTask.startService(ServiceControllerImpl.java:1948)
at org.jboss.msc.service.ServiceControllerImpl$StartTask.run(ServiceControllerImpl.java:1881)
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: java.lang.NoClassDefFoundError: Failed to link de/istec/pls/client/db/listener/DBListener (Module "deployment.client.pls-sc-1.0.0-SNAPSHOT.war:main" from Service Module Loader): oracle/jdbc/dcn/DatabaseChangeListener
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:422)
at org.jboss.modules.ModuleClassLoader.defineClass(ModuleClassLoader.java:446)
at org.jboss.modules.ModuleClassLoader.loadClassLocal(ModuleClassLoader.java:274)
at org.jboss.modules.ModuleClassLoader$1.loadClassLocal(ModuleClassLoader.java:78)
at org.jboss.modules.Module.loadModuleClass(Module.java:606)
at org.jboss.modules.ModuleClassLoader.findClass(ModuleClassLoader.java:190)
at org.jboss.modules.ConcurrentClassLoader.performLoadClassUnchecked(ConcurrentClassLoader.java:363)
at org.jboss.modules.ConcurrentClassLoader.performLoadClass(ConcurrentClassLoader.java:351)
at org.jboss.modules.ConcurrentClassLoader.loadClass(ConcurrentClassLoader.java:93)
at org.wildfly.extension.undertow.deployment.ServletContainerInitializerDeploymentProcessor.loadClassInfoSet(ServletContainerInitializerDeploymentProcessor.java:259)
at org.wildfly.extension.undertow.deployment.ServletContainerInitializerDeploymentProcessor.deploy(ServletContainerInitializerDeploymentProcessor.java:169)
at org.jboss.as.server.deployment.DeploymentUnitPhaseService.start(DeploymentUnitPhaseService.java:147)
【问题讨论】：
-
您绝对不想将驱动程序打包到您的 WAR 中。您是否为驱动程序添加了模块或部署了 JAR？您可能希望根据自己的情况为其创建一个模块。
-
我刚刚通过管理控制台部署了 JAR。
-
通过管理控制台部署的 JAR 文件将可用于配置文件中定义的数据源。如果你想让 JDBC 驱动程序类对 webapp 可用，那么你必须在 Webapp 类路径中创建模块或添加 JDBC 驱动程序 jar
标签： jdbc wildfly wildfly-10