当我在Eclipse IDE中本地运行程序时，JethroJDBC DriverManager.getConnection工作正常，但是在使用 Dependencies.jar 运行Maven Snapshot时，同样的代码抛出NullPointerException。在可执行jar中，我可以看到 com.jethrodata 包中存在这些类。
请帮帮我。
HOST="jdbc:JethroData://UATSERVERHOST:9111/UATINSTANCE"
USER= "USERNAME"
PASS= "PassWord"
public Connection getConnection(String HOST, String USER, String PASS) throws IOException
{
Connection connection = null;
try {
Class.forName("com.jethrodata.JethroDriver");
//STEP 3: Open a connection
connection = DriverManager.getConnection(HOST, USER, PASS);
return connection;
}
catch(Exception e) {
TestAutomationOutput.outputLog("There is an exception in connecting to the jethro database \r\n"+e);
e.printStackTrace();
}
return null;
}
<dependency>
<groupId>com.jethro</groupId>
<artifactId>jethrojdbc</artifactId>
<version>3.8</version>
</dependency>
<build>
<sourceDirectory>src</sourceDirectory>
<resources>
<resource>
<directory>src</directory>
<excludes>
<exclude>**/*.java</exclude>
</excludes>
</resource>
</resources>
<plugins>
<plugin>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.7.0</version>
<configuration>
<source>1.8</source>
<target>1.8</target>
</configuration>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-dependency-plugin</artifactId>
<executions>
<execution>
<id>copy</id>
<phase>package</phase>
<goals>
<goal>copy-dependencies</goal>
</goals>
<configuration>
<outputDirectory>
${project.build.directory}/lib
</outputDirectory>
</configuration>
</execution>
</executions>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-jar-plugin</artifactId>
<version>3.0.2</version>
<configuration>
<archive>
<manifest>
<addClasspath>true</addClasspath>
<classpathPrefix>lib/</classpathPrefix>
<mainClass>rdltestmodule.RDLAutomationFrame</mainClass>
</manifest>
</archive>
</configuration>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-assembly-plugin</artifactId>
<version>2.2-beta-5</version>
<executions>
<execution>
<phase>package</phase>
<goals>
<goal>single</goal>
</goals>
<configuration>
<archive>
<manifest>
<mainClass>rdltestmodule.RDLAutomationFrame</mainClass>
</manifest>
</archive>
<descriptorRefs>
<descriptorRef>jar-with-dependencies</descriptorRef>
</descriptorRefs>
</configuration>
</execution>
</executions>
</plugin>
</plugins>
</build>
java.sql.SQLException: java.lang.NullPointerException
at com.jethrodata.JethroDriver.connect(JethroDriver.java:115)
at com.jethrodata.JethroDriver.connect(JethroDriver.java:16)
at java.sql.DriverManager.getConnection(Unknown Source)
at java.sql.DriverManager.getConnection(Unknown Source)
at rdltestmodule.JethroConnection.getConnection(JethroConnection.java:36)
at rdltestmodule.TestManager.MasterTest(TestManager.java:39)
at rdltestmodule.RDLAutomationFrame$2.actionPerformed(RDLAutomationFrame.java:253)
at javax.swing.AbstractButton.fireActionPerformed(Unknown Source)
at javax.swing.AbstractButton$Handler.actionPerformed(Unknown Source)
at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source)
at javax.swing.DefaultButtonModel.setPressed(Unknown Source)
at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(Unknown Source)
at java.awt.Component.processMouseEvent(Unknown Source)
at javax.swing.JComponent.processMouseEvent(Unknown Source)
at java.awt.Component.processEvent(Unknown Source)
at java.awt.Container.processEvent(Unknown Source)
at java.awt.Component.dispatchEventImpl(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source)
at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)
at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Window.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.EventQueue.dispatchEventImpl(Unknown Source)
at java.awt.EventQueue.access$500(Unknown Source)
at java.awt.EventQueue$3.run(Unknown Source)
at java.awt.EventQueue$3.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(Unknown Source)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(Unknown Source)
at java.awt.EventQueue$4.run(Unknown Source)
at java.awt.EventQueue$4.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(Unknown Source)
at java.awt.EventQueue.dispatchEvent(Unknown Source)
at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.run(Unknown Source)
答案 0 :(得分：1)
https://jethro.io/driver-downloads 您可以下载jethro jar并将其粘贴到您的项目中，并提供如下所示的依赖
<dependency>
<groupId>com.jethrodata</groupId>
<artifactId>jethro-jdbc</artifactId>
<version>3.8</version>
<systemPath>${basedir}\src\main\resources\lib\jethro-jdbc-3.8.jar</systemPath>
<scope>system</scope>
</dependency>
您可以使用JethroConnection类进行下面的检查
JethroConnection connection = null;
try {
Class.forName("com.jethrodata.JethroDriver");
} catch (ClassNotFoundException e) {
e.printStackTrace();
}
try {
connection = ((JethroConnection) DriverManager
.getConnection(url, username, password));
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
JethroStatement stmt = null;
JethroResultSet rs = null;
stmt = (JethroStatement) connection.createStatement();