使用derby数据库首次连接时的ERROR 42Y07问题-Mysql Tutorial-php.cn

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使用derby数据库首次连接时的ERROR 42Y07问题

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Jun 07, 2016 pm 05:17 PM

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近日，使用某产品安装部署，在首次运行时，后台抛出以下异常：Caused by: java.sql.SQLException: Schema

近日，使用某产品安装部署，在首次运行时，后台抛出以下异常：

Caused by: java.sql.SQLException: Schema 'ROOT' does not exist
   at org.apache.derby.impl.jdbc.SQLExceptionFactory.getSQLException(Unknown Source)
   at org.apache.derby.impl.jdbc.SQLExceptionFactory40.wrapArgsForTransportAcrossDRDA(Unknown Source)
   ... 72 more
Caused by: ERROR 42Y07: Schema 'ROOT' does not exist
   at org.apache.derby.iapi.error.StandardException.newException(Unknown Source)
   at org.apache.derby.impl.sql.catalog.DataDictionaryImpl.getSchemaDescriptor(Unknown Source)
   at org.apache.derby.impl.sql.compile.QueryTreeNode.getSchemaDescriptor(Unknown Source)
   at org.apache.derby.impl.sql.compile.QueryTreeNode.getSchemaDescriptor(Unknown Source)
   at org.apache.derby.impl.sql.compile.FromBaseTable.bindTableDescriptor(Unknown Source)
   at org.apache.derby.impl.sql.compile.FromBaseTable.bindNonVTITables(Unknown Source)
   at org.apache.derby.impl.sql.compile.FromList.bindTables(Unknown Source)
   at org.apache.derby.impl.sql.compile.SelectNode.bindNonVTITables(Unknown Source)
   at org.apache.derby.impl.sql.compile.DMLStatementNode.bindTables(Unknown Source)
   at org.apache.derby.impl.sql.compile.DMLStatementNode.bind(Unknown Source)
   at org.apache.derby.impl.sql.compile.CursorNode.bindState

单从异常来看是由于名为“ROOT”的Schema不存在造成的异常，由于数据库使用的是derby数据库而且手头上木有相应的客户端工具，因此，无法验证此问题。还是求助Google。

关键字：Caused by: ERROR 42Y07: Schema 'ROOT' does not exist，结果中有一位xd介绍“Continuum入门”的博文(作者：jiangshachina，地址：)，此文中提到作者也遇到此问题，而且给出明确解释：

2.3 启动Continuum
假设此时已经安装了Continuum，但还没有运行它。要运行Continuum，可以双击Continuum_Home\bin\win32\run.bat文件。对于第一次运行，，会报一些错误：

……
WARN RDBMS - Error initialising derby schema : Schema 'SA' does not exist
ERROR 42Y07: Schema 'SA' does not exist
……

这种情况是正常的，因为Continuum后台使用的是Apache Derby数据库，在第一次运行之前，Continuum所需要的一些表和数据并不存在。但Continuum会初始化这些数据，当第2次启动Continuum时，这些错误就不会出现了。

按照这个思路，我再次启动产品，发现后台这些异常信息，不断抛出，看来服务是正在运行，等后台不再抛异常以后，重启。

后台正常了！！！

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