WSO2 ESB:在dblookup中介中配置数据库连接失败

我使用IntegrationStudio创建了一个ESB项目，然后创建了一个代理服务并添加了一个dblookup中介。我已经将其配置为使用postgresql数据库。我的配置如下所述

连接类型为

DB\u连接

在数据库配置窗口中，我选择连接类型为postgresql

我选择了“从服务器获取”单选按钮，从组合列表中选择了“42.2.5”，并输入了连接参数

连接数据库驱动程序：

com.postgres.jdbc.Driver

（尝试使用

org.postgresql.Driver

） jdbc url连接：

jdbc:postgresql://localhost:5432/EDH_DATABASE

连接用户名：

postgres

密码：

已输入

测试连接工作正常。但是当通过IntegrationStudio运行代理时，会出现以下错误

注意：我将postgresql-42.2.5.jar复制到IntegrationStudio.app/Contents/Eclipse/runtime/microesb/lib

[2020-01-08 17:39:25,612] ERROR {org.apache.synapse.mediators.db.DBLookupMediator} - SQL Exception occurred while executing statement : select * from teacher; against DataSource : jdbc:postgresql://localhost:5432/EDH_DATABASE org.apache.commons.dbcp.SQLNestedException: Cannot load JDBC driver class     'com.postgres.jdbc.Driver'
    at org.apache.commons.dbcp.BasicDataSource.createConnectionFactory(BasicDataSource.java:1429)
    at org.apache.commons.dbcp.BasicDataSource.createDataSource(BasicDataSource.java:1371)
    at org.apache.commons.dbcp.BasicDataSource.getConnection(BasicDataSource.java:1044)
    at org.apache.synapse.mediators.db.DBLookupMediator.processStatement(DBLookupMediator.java:58)
    at org.apache.synapse.mediators.db.AbstractDBMediator.mediate(AbstractDBMediator.java:243)
    at org.apache.synapse.mediators.AbstractListMediator.mediate(AbstractListMediator.java:109)
    at org.apache.synapse.mediators.AbstractListMediator.mediate(AbstractListMediator.java:71)
    at org.apache.synapse.mediators.base.SequenceMediator.mediate(SequenceMediator.java:158)
    at org.apache.synapse.core.axis2.ProxyServiceMessageReceiver.receive(ProxyServiceMessageReceiver.java:224)
    at org.apache.axis2.engine.AxisEngine.receive(AxisEngine.java:180)
    at org.apache.synapse.transport.passthru.ServerWorker.processNonEntityEnclosingRESTHandler(ServerWorker.java:367)
    at org.apache.synapse.transport.passthru.ServerWorker.processEntityEnclosingRequest(ServerWorker.java:412)
    at org.apache.synapse.transport.passthru.ServerWorker.run(ServerWorker.java:181)
    at org.apache.axis2.transport.base.threads.NativeWorkerPool$1.run(NativeWorkerPool.java:172)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
    at java.lang.Thread.run(Thread.java:748)
     Caused by: java.lang.ClassNotFoundException: com.postgres.jdbc.Driver
    at java.net.URLClassLoader.findClass(URLClassLoader.java:382)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:349)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
    at org.eclipse.osgi.internal.framework.ContextFinder.loadClass(ContextFinder.java:139)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
    at org.apache.commons.dbcp.BasicDataSource.createConnectionFactory(BasicDataSource.java:1420)
    ... 16 more

postgresql-42.2.5.jar没有路径

“com.postgresql.jdbc.Driver”

。 因此尝试将“org.postgresql.Driver”作为连接数据库驱动程序字段值。但它仍然给出了同样的错误。尽管使用了“org.postgresql.Driver”，但使用了可配置字段，它仍然会给出相同的错误

    [2020-01-08 17:39:25,612] ERROR {org.apache.synapse.mediators.db.DBLookupMediator} - SQL Exception occurred while executing statement : select * from teacher; against DataSource : jdbc:postgresql://localhost:5432/EDH_DATABASE org.apache.commons.dbcp.SQLNestedException: 
     Cannot load JDBC driver class 'com.postgres.jdbc.Driver'
    at 
    org.apache.commons.dbcp.BasicDataSource.createConnectionFactory(BasicDataSource.java:1429)
    at org.apache.commons.dbcp.BasicDataSource.createDataSource(BasicDataSource.java:1371)
    at org.apache.commons.dbcp.BasicDataSource.getConnection(BasicDataSource.java:1044)
    at 
    org.apache.synapse.mediators.db.DBLookupMediator.processStatement(DBLookupMediator.java:58)
    at org.apache.synapse.mediators.db.AbstractDBMediator.mediate(AbstractDBMediator.java:243)
    at org.apache.synapse.mediators.AbstractListMediator.mediate(AbstractListMediator.java:109)
    at org.apache.synapse.mediators.AbstractListMediator.mediate(AbstractListMediator.java:71)
    at org.apache.synapse.mediators.base.SequenceMediator.mediate(SequenceMediator.java:158)
    at Org.apache.synapse.core.axis2.ProxyServiceMessageReceiver.receive(ProxyServiceMessageReceiver.java:224)
    at org.apache.axis2.engine.AxisEngine.receive(AxisEngine.java:180)
    at org.apache.synapse.transport.passthru.ServerWorker.processNonEntityEnclosingRESTHandler(ServerWorker.java:367)
    at 
        org.apache.synapse.transport.passthru.ServerWorker.processEntityEnclosingRequest(ServerWorker.java:412)
    at org.apache.synapse.transport.passthru.ServerWorker.run(ServerWorker.java:181)
    at 
        org.apache.axis2.transport.base.threads.NativeWorkerPool$1.run(NativeWorkerPool.java:172)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
    at java.lang.Thread.run(Thread.java:748)
        Caused by: java.lang.ClassNotFoundException: com.postgres.jdbc.Driver
    at java.net.URLClassLoader.findClass(URLClassLoader.java:382)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:349)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
    at org.eclipse.osgi.internal.framework.ContextFinder.loadClass(ContextFinder.java:139)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
    at 
    org.apache.commons.dbcp.BasicDataSource.createConnectionFactory(BasicDataSource.java:1420)
    ... 16 more

---

任何帮助都将不胜感激。

似乎正确的驱动程序名称是“org.postgresql.Driver”。在错误日志中，尽管您已将驱动程序名称从“com.postgres.jdbc.Driver”更改为“org.postgresql.Driver”，但它似乎在寻找前一个。请确保您已通过单击停止按钮停止运行Micro Integrator，并通过单击“运行方式->在Micro Integrator上运行”再次运行代理。

正确的驱动程序名称似乎是“org.postgresql.Driver”。在错误日志中，尽管您已将驱动程序名称从“com.postgres.jdbc.Driver”更改为“org.postgresql.Driver”，但它似乎在寻找前一个。请确保您已通过单击停止按钮停止运行Micro Integrator，并通过单击“运行方式->在Micro Integrator上运行”再次运行代理。

我对驱动程序名称所做的更改未刷新。现在它正在工作。谢谢。我对驱动程序名称所做的更改没有刷新。现在它正在工作。谢谢