如何修复连接到 java 中的数据库的网络协议错误（SQLNonTransient）

Question

问题信息在这里；

Java.sql.SQLNonTransientConnectionException: A network protocol error was encountered and the connection has been terminated:The requested command encountered an unarchitected and implementation-specific condition for which there was no architected message (additional information may be available in the derby.log file on the server).

我还看了德比日志。它说拒绝访问其中一个 derby 文件

ava.sql.SQLNonTransientConnectionException: A network protocol error was encountered and the connection has been terminated: The requested command encountered an unarchitected and implementation-specific condition for which there was no architected message (additional information may be available in the derby.log file on the server).
at org.apache.derby.client.am.SQLExceptionFactory.getSQLException(Unknown Source)
at org.apache.derby.client.am.SqlException.getSQLException(Unknown Source)
at org.apache.derby.client.am.ClientStatement.executeQuery(Unknown Source)
at habersitesihabertakibi.SQLCommand.select(SQLCommand.java:43)
at habersitesihabertakibi.Site.getKullaniciSayisi(Site.java:423)
at habersitesihabertakibi.GirisPaneli.<init>(GirisPaneli.java:36)
at habersitesihabertakibi.GirisPaneli$3.run(GirisPaneli.java:234)
at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:311)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:756)
at java.awt.EventQueue.access$500(EventQueue.java:97)
at java.awt.EventQueue$3.run(EventQueue.java:709)
at java.awt.EventQueue$3.run(EventQueue.java:703)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:76)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:726)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:201)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)
    at java.awt.EventDispatchThread.run(EventDispatchThread.java:82)
Caused by: ERROR 08006: A network protocol error was encountered and the connection has been terminated: The requested command encountered an unarchitected and implementation-specific condition for which there was no architected message (additional information may be available in the derby.log file on the server).
    at org.apache.derby.client.net.NetConnectionReply.parseCMDCHKRM(Unknown Source)
    at org.apache.derby.client.net.NetStatementReply.parsePrepareError(Unknown Source)
    at org.apache.derby.client.net.NetStatementReply.parsePRPSQLSTTreply(Unknown Source)
    at org.apache.derby.client.net.NetStatementReply.readPrepareDescribeOutput(Unknown Source)
    at org.apache.derby.client.net.StatementReply.readPrepareDescribeOutput(Unknown Source)
    at org.apache.derby.client.net.NetStatement.readPrepareDescribeOutput_(Unknown Source)
    at 

org.apache.derby.client.am.ClientStatement.readPrepareDescribeOutput(Unknown Source)
    at org.apache.derby.client.am.ClientStatement.flowExecute(Unknown Source)
    at org.apache.derby.client.am.ClientStatement.executeQueryX(Unknown Source)
    ... 19 more 
Caused by: ERROR XSDG3: DERBY SQL error: ERRORCODE: 45000, SQLSTATE: XSDG3, SQLERRMC: Meta-data for unknown could not be accessed to read C:\Users\bilal.harmansa\.netbeans-derby\habersitesitakibi\seg0\c860.dat::SQLSTATE: XJ001
... 28 more

Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
    at habersitesihabertakibi.Site.getKullaniciSayisi(Site.java:426)
    at habersitesihabertakibi.GirisPaneli.<init>(GirisPaneli.java:36)
    at habersitesihabertakibi.GirisPaneli$3.run(GirisPaneli.java:234)
    at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:311)
    at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:756)
    at java.awt.EventQueue.access$500(EventQueue.java:97)
    at java.awt.EventQueue$3.run(EventQueue.java:709)
    at java.awt.EventQueue$3.run(EventQueue.java:703)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:76)
    at java.awt.EventQueue.dispatchEvent(EventQueue.java:726)
    at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:201)
    at 

java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116)
        at java.awt.EventDispatchThread.pumpEventsForHierarchy(E

ventDispatchThread.java:105)
    at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
    at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)
    at java.awt.EventDispatchThread.run(EventDispatchThread.java:82)
BUILD STOPPED (total time: 5 minutes 1 second)

所以伙计们，我可以连接到数据库我的意思是我点击了连接，看起来我已经连接了，我可以看到表格，但我无法查看数据库上的数据。我在互联网上搜索了一段时间，但还是一样，我找不到解决方案。 2天前我更新了netbeans，然后它开始不起作用:)

Answer 1

我做了一些事情，现在可以了。我不知道为什么，但我会告诉你我做了什么。

首先我在 netbeans 上获得了我的数据库文件路径

C:\Users\bilal.harmansa.netbeans-derby

之后，我将“.netbeans-derby”复制到 D:\，然后我更改了 netbeans 中的路径。（NetBeans>Services>JavaDB 右键单击​​属性 > 数据库位置

我改成了 D:\.netbeans-derby。

我关闭了netbeans并再次打开它。我试图连接它给了我一些红线，但它连接了，我可以看到我的数据。之后我去了原始路径 C:\Users\bilal.harmansa.netbeans-derby

我删除了 .netbeans-derby。之后我在驱动程序 D:\ 中复制了 .netbeans-derby 并粘贴到

C:\Users\bilal.harmansa\ 。

最后去了netbeans并将数据库位置设置为原始位置。（我们将其更改为D：.netbeans-derby）应该是

C:\Users\bilal.harmansa.netbeans-derby

再次。

就是这样。如果您有同样的问题，它现在可能有效。我的意思是无法读取文件导致访问被拒绝。我希望你也能解决你的问题:)