SQuirreL Simplicit vjdbc VirtualDriver java.sql.SQLException:java.lang.NullPointerException

使用SQuirreL连接/查询分布式MariaDB，每次执行查询后，我都会得到一个

java.sql.SQLException:java.lang.NullPointerException

。它甚至出现在

从catalog\u name显示表时或
显示表_name中的列查询类型。这是这个司机的常见行为吗？我有什么毛病吗

错误显示在它自己的结果“错误”选项卡中，就在我想要的结果的选项卡后面。到目前为止，这只是一个忽略它的问题（Ctrl+Shift+F4），因此这是一个小麻烦，因为生成的另一个结果选项卡显示了良好的数据。但我想知道这是否是其他错误（安装、版本协调等）的症状：每次看到红色的堆栈跟踪都会在我的脑海中升起一些标记，即使我知道我的结果就在红色文本后面

我使用Simplicit的vjdbc驱动程序de.Simplicit.vjdbc.VirtualDriver.class
连接到分布式MariaDB。同一SQuirreL实例中的其他驱动程序（DB2）没有显示错误。vjdbc驱动程序版本为1.6.5。（从2007年开始）并且没有更高版本，我也无法访问此安装的clear代码

JVM是1.7.0_40：

C:\Users\manuelvigarcia>java -version
java version "1.7.0_40"
Java(TM) SE Runtime Environment (build 1.7.0_40-b43)
Java HotSpot(TM) 64-Bit Server VM (build 24.0-b56, mixed mode)

同样如松鼠“关于”中所列：

松鼠版本是3.6

我假设该错误是在Simplicit VirtualDriver中产生的，给定了异常堆栈跟踪的顶部，但我没有访问代码的权限

最后，我将显示查询：

SELECT latitude, longitude, country_id FROM appartment_master.studio
WHERE appartment_id = 3000;

生成正确的结果窗格：

latitude    longitude   country_id
12.59565    38.76614    11

以及包含异常堆栈跟踪的错误窗格：

Error: java.sql.SQLException: java.lang.NullPointerException
    at de.simplicit.vjdbc.serial.StreamingResultSet.populate(StreamingResultSet.java:141)
    at de.simplicit.vjdbc.server.command.ConnectionEntry.handleResultSet(ConnectionEntry.java:337)
    at de.simplicit.vjdbc.server.command.ConnectionEntry.executeCommand(ConnectionEntry.java:223)
    at de.simplicit.vjdbc.server.command.CommandProcessor.process(CommandProcessor.java:169)
    at de.simplicit.vjdbc.server.rmi.CommandSinkRmiImpl.process(CommandSinkRmiImpl.java:39)
    at sun.reflect.GeneratedMethodAccessor81.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:606)
    at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:322)
    at sun.rmi.transport.Transport$2.run(Transport.java:202)
    at sun.rmi.transport.Transport$2.run(Transport.java:199)
    at java.security.AccessController.doPrivileged(Native Method)
    at sun.rmi.transport.Transport.serviceCall(Transport.java:198)
    at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:567)
    at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(TCPTransport.java:828)
    at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.access$400(TCPTransport.java:619)
    at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler$1.run(TCPTransport.java:684)
    at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler$1.run(TCPTransport.java:681)
    at java.security.AccessController.doPrivileged(Native Method)
    at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:681)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
    at java.lang.Thread.run(Thread.java:745)

    at de.simplicit.vjdbc.util.SQLExceptionHelper.wrapThrowable(SQLExceptionHelper.java:59)
    at de.simplicit.vjdbc.util.SQLExceptionHelper.wrap(SQLExceptionHelper.java:17)
    at de.simplicit.vjdbc.server.command.CommandProcessor.process(CommandProcessor.java:180)
    at de.simplicit.vjdbc.server.rmi.CommandSinkRmiImpl.process(CommandSinkRmiImpl.java:39)
    at sun.reflect.GeneratedMethodAccessor81.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:606)
    at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:322)
    at sun.rmi.transport.Transport$2.run(Transport.java:202)
    at sun.rmi.transport.Transport$2.run(Transport.java:199)
    at java.security.AccessController.doPrivileged(Native Method)
    at sun.rmi.transport.Transport.serviceCall(Transport.java:198)
    at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:567)
    at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(TCPTransport.java:828)
    at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.access$400(TCPTransport.java:619)
    at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler$1.run(TCPTransport.java:684)
    at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler$1.run(TCPTransport.java:681)
    at java.security.AccessController.doPrivileged(Native Method)
    at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:681)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
    at java.lang.Thread.run(Thread.java:745)
    at sun.rmi.transport.StreamRemoteCall.exceptionReceivedFromServer(StreamRemoteCall.java:275)
    at sun.rmi.transport.StreamRemoteCall.executeCall(StreamRemoteCall.java:252)
    at sun.rmi.server.UnicastRef.invoke(UnicastRef.java:161)
    at java.rmi.server.RemoteObjectInvocationHandler.invokeRemoteMethod(RemoteObjectInvocationHandler.java:194)
    at java.rmi.server.RemoteObjectInvocationHandler.invoke(RemoteObjectInvocationHandler.java:148)
    at com.sun.proxy.$Proxy6.process(Unknown Source)
    at de.simplicit.vjdbc.rmi.CommandSinkRmiProxy.process(CommandSinkRmiProxy.java:40)
    at de.simplicit.vjdbc.command.DecoratedCommandSink.process(DecoratedCommandSink.java:69)
    at de.simplicit.vjdbc.VirtualStatement.getResultSet(VirtualStatement.java:150)
    at net.sourceforge.squirrel_sql.client.session.StatementWrapper.getResultSetWrapper(StatementWrapper.java:101)
    at net.sourceforge.squirrel_sql.client.session.SQLExecuterTask.processQuery(SQLExecuterTask.java:398)
    at net.sourceforge.squirrel_sql.client.session.SQLExecuterTask.run(SQLExecuterTask.java:212)
    at net.sourceforge.squirrel_sql.fw.util.TaskExecuter.run(TaskExecuter.java:82)
    at java.lang.Thread.run(Thread.java:724)

SQLState:  null
ErrorCode: 0

让我们看一个示例查询和尝试执行它的Java代码。在问题中添加了查询和结果。没有Java代码：我正在从SQuirreL GUI查询DB。让我们看一个示例查询和尝试执行它的Java代码。在问题中添加了查询和结果。没有Java代码：我正在从SquirrelGUI查询数据库。
Error: java.sql.SQLException: java.lang.NullPointerException
    at de.simplicit.vjdbc.serial.StreamingResultSet.populate(StreamingResultSet.java:141)
    at de.simplicit.vjdbc.server.command.ConnectionEntry.handleResultSet(ConnectionEntry.java:337)
    at de.simplicit.vjdbc.server.command.ConnectionEntry.executeCommand(ConnectionEntry.java:223)
    at de.simplicit.vjdbc.server.command.CommandProcessor.process(CommandProcessor.java:169)
    at de.simplicit.vjdbc.server.rmi.CommandSinkRmiImpl.process(CommandSinkRmiImpl.java:39)
    at sun.reflect.GeneratedMethodAccessor81.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:606)
    at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:322)
    at sun.rmi.transport.Transport$2.run(Transport.java:202)
    at sun.rmi.transport.Transport$2.run(Transport.java:199)
    at java.security.AccessController.doPrivileged(Native Method)
    at sun.rmi.transport.Transport.serviceCall(Transport.java:198)
    at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:567)
    at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(TCPTransport.java:828)
    at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.access$400(TCPTransport.java:619)
    at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler$1.run(TCPTransport.java:684)
    at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler$1.run(TCPTransport.java:681)
    at java.security.AccessController.doPrivileged(Native Method)
    at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:681)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
    at java.lang.Thread.run(Thread.java:745)

    at de.simplicit.vjdbc.util.SQLExceptionHelper.wrapThrowable(SQLExceptionHelper.java:59)
    at de.simplicit.vjdbc.util.SQLExceptionHelper.wrap(SQLExceptionHelper.java:17)
    at de.simplicit.vjdbc.server.command.CommandProcessor.process(CommandProcessor.java:180)
    at de.simplicit.vjdbc.server.rmi.CommandSinkRmiImpl.process(CommandSinkRmiImpl.java:39)
    at sun.reflect.GeneratedMethodAccessor81.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:606)
    at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:322)
    at sun.rmi.transport.Transport$2.run(Transport.java:202)
    at sun.rmi.transport.Transport$2.run(Transport.java:199)
    at java.security.AccessController.doPrivileged(Native Method)
    at sun.rmi.transport.Transport.serviceCall(Transport.java:198)
    at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:567)
    at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(TCPTransport.java:828)
    at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.access$400(TCPTransport.java:619)
    at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler$1.run(TCPTransport.java:684)
    at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler$1.run(TCPTransport.java:681)
    at java.security.AccessController.doPrivileged(Native Method)
    at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:681)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
    at java.lang.Thread.run(Thread.java:745)
    at sun.rmi.transport.StreamRemoteCall.exceptionReceivedFromServer(StreamRemoteCall.java:275)
    at sun.rmi.transport.StreamRemoteCall.executeCall(StreamRemoteCall.java:252)
    at sun.rmi.server.UnicastRef.invoke(UnicastRef.java:161)
    at java.rmi.server.RemoteObjectInvocationHandler.invokeRemoteMethod(RemoteObjectInvocationHandler.java:194)
    at java.rmi.server.RemoteObjectInvocationHandler.invoke(RemoteObjectInvocationHandler.java:148)
    at com.sun.proxy.$Proxy6.process(Unknown Source)
    at de.simplicit.vjdbc.rmi.CommandSinkRmiProxy.process(CommandSinkRmiProxy.java:40)
    at de.simplicit.vjdbc.command.DecoratedCommandSink.process(DecoratedCommandSink.java:69)
    at de.simplicit.vjdbc.VirtualStatement.getResultSet(VirtualStatement.java:150)
    at net.sourceforge.squirrel_sql.client.session.StatementWrapper.getResultSetWrapper(StatementWrapper.java:101)
    at net.sourceforge.squirrel_sql.client.session.SQLExecuterTask.processQuery(SQLExecuterTask.java:398)
    at net.sourceforge.squirrel_sql.client.session.SQLExecuterTask.run(SQLExecuterTask.java:212)
    at net.sourceforge.squirrel_sql.fw.util.TaskExecuter.run(TaskExecuter.java:82)
    at java.lang.Thread.run(Thread.java:724)

SQLState:  null
ErrorCode: 0