如何为 tomcat 6 及其部署的 webapps 正确配置 JNDI？

Posted 2023-02-25

【中文标题】如何为 tomcat 6 及其部署的 webapps 正确配置 JNDI？

【英文标题】：How to configure properly JNDI for tomcat 6 and its deployed webapps?

【发布时间】：2013-07-02 05:55:06

【问题描述】：

我有一个嵌入式 derby 数据库，其中包含用于 USERS、ROLES、USERS_ROLES 等的表。我的要求是使用它进行 tomcat 身份验证。另外，我创建了一个 spring webapp 以便以更简单的方式管理用户、角色等。

之前我在 applicationContext 中定义了这个数据源：

<bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource"
    p:driverClassName="org.apache.derby.jdbc.EmbeddedDriver"
    p:url="jdbc:derby:C:\tools\derbydb"
    p:connectionProperties=""
    p:username="APP"
    p:password="" />

我已将此方法更改为 JNDI，现在我已在 webapp/WEB-INF/context.xml 中定义了 db 资源

<Context>
    <Resource name="jdbc/adminDB" auth="Container" type="javax.sql.DataSource"
            maxActive="20" maxIdle="10" username="APP" password=""
            driverClassName="org.apache.derby.jdbc.EmbeddedDriver"
            url="jdbc:derby:C:\tools\derbydb"/>
</Context>

在我的 applicationContext.xml 中：

<bean id="dataSource" class="org.springframework.jndi.JndiObjectFactoryBean">
    <property name="jndiName" value="java:comp/env/jdbc/adminDB"/>
</bean>

在 Eclipse 中它工作正常。我可以读取值、编辑、登录等。

我的问题与在 tomcat 6 上允许这样做有关。我已经阅读了一些页面，包括 *** 的问题，但我没有找到我的具体问题。我已经部署了另一个应用程序，它使用 tomcat 安全性来访问一些数据。它是由第三方开发的应用程序。使用旧配置可以正常工作（server.xml）：

<Realm className="org.apache.catalina.realm.JDBCRealm" driverName="org.apache.derby.jdbc.EmbeddedDriver" connectionURL="jdbc:derby:C:\tools\derbydb" connectionName="APP" connectionPassword="" userTable="USERS" userNameCol="USERNAME" userCredCol="PASSWORD" userRoleTable="V_USERS_ROLES" roleNameCol="ROLENAME"/>

并且我能够使用 tomcat 使用数据库中定义的用户登录。但是现在，我定义了这样的东西（server.xml）：

<Realm className="org.apache.catalina.realm.DataSourceRealm" dataSourceName="jdbc/adminDB" userTable="USERS" userNameCol="USERNAME" userCredCol="PASSWORD" userRoleTable="V_USERS_ROLES" roleNameCol="ROLENAME"/>

并在 server.xml (GlobalNamingResources) 中

<Resource name="jdbc/adminDB" auth="Container" type="javax.sql.DataSource"
        maxActive="20" maxIdle="10" username="APP" password=""
        driverClassName="org.apache.derby.jdbc.EmbeddedDriver"
        url="jdbc:derby:C:\tools\derbydb"/>

当我尝试登录时出现此错误：

SEVERE: Excepci¾n realizando autenticaci¾n
org.apache.tomcat.dbcp.dbcp.SQLNestedException: Cannot create PoolableConnectionFactory (Failed to s
tart database 'C:\tools\derbydb' with class loader org.apache.catalina.loader.StandardClassLoader@23
49e5ef, see the next exception for details.)
        at org.apache.tomcat.dbcp.dbcp.BasicDataSource.createPoolableConnectionFactory(BasicDataSour
ce.java:1549)
        at org.apache.tomcat.dbcp.dbcp.BasicDataSource.createDataSource(BasicDataSource.java:1388)
        at org.apache.tomcat.dbcp.dbcp.BasicDataSource.getConnection(BasicDataSource.java:1044)
        at org.apache.catalina.realm.DataSourceRealm.open(DataSourceRealm.java:416)
        at org.apache.catalina.realm.DataSourceRealm.authenticate(DataSourceRealm.java:296)
        at org.apache.catalina.authenticator.BasicAuthenticator.authenticate(BasicAuthenticator.java
:181)
        at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:528)
        at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
        at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)
        at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
        at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:293)
        at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:861)
        at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.ja
va:606)
        at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
        at java.lang.Thread.run(Thread.java:722)
Caused by: java.sql.SQLException: Failed to start database 'C:\tools\derbydb' with class loader org.
apache.catalina.loader.StandardClassLoader@2349e5ef, see the next exception for details.
        at org.apache.derby.impl.jdbc.SQLExceptionFactory40.getSQLException(Unknown Source)
        at org.apache.derby.impl.jdbc.Util.newEmbedSQLException(Unknown Source)
        at org.apache.derby.impl.jdbc.Util.seeNextException(Unknown Source)
        at org.apache.derby.impl.jdbc.EmbedConnection.bootDatabase(Unknown Source)
        at org.apache.derby.impl.jdbc.EmbedConnection.<init>(Unknown Source)
        at org.apache.derby.impl.jdbc.EmbedConnection30.<init>(Unknown Source)
        at org.apache.derby.impl.jdbc.EmbedConnection40.<init>(Unknown Source)
        at org.apache.derby.jdbc.Driver40.getNewEmbedConnection(Unknown Source)
        at org.apache.derby.jdbc.InternalDriver.connect(Unknown Source)
        at org.apache.derby.jdbc.AutoloadedDriver.connect(Unknown Source)
        at org.apache.tomcat.dbcp.dbcp.DriverConnectionFactory.createConnection(DriverConnectionFact
ory.java:38)
        at org.apache.tomcat.dbcp.dbcp.PoolableConnectionFactory.makeObject(PoolableConnectionFactor
y.java:582)
        at org.apache.tomcat.dbcp.dbcp.BasicDataSource.validateConnectionFactory(BasicDataSource.jav
a:1556)
        at org.apache.tomcat.dbcp.dbcp.BasicDataSource.createPoolableConnectionFactory(BasicDataSour
ce.java:1545)
        ... 14 more
Caused by: java.sql.SQLException: Failed to start database 'C:\tools\derbydb' with class loader org.
apache.catalina.loader.StandardClassLoader@2349e5ef, see the next exception for details.
        at org.apache.derby.impl.jdbc.SQLExceptionFactory.getSQLException(Unknown Source)
        at org.apache.derby.impl.jdbc.SQLExceptionFactory40.wrapArgsForTransportAcrossDRDA(Unknown S
ource)
        ... 28 more
Caused by: java.sql.SQLException: Another instance of Derby may have already booted the database C:\
tools\derbydb.
        at org.apache.derby.impl.jdbc.SQLExceptionFactory.getSQLException(Unknown Source)
        at org.apache.derby.impl.jdbc.SQLExceptionFactory40.wrapArgsForTransportAcrossDRDA(Unknown S
ource)
        at org.apache.derby.impl.jdbc.SQLExceptionFactory40.getSQLException(Unknown Source)
        at org.apache.derby.impl.jdbc.Util.generateCsSQLException(Unknown Source)
        ... 25 more
Caused by: ERROR XSDB6: Another instance of Derby may have already booted the database C:\tools\derb
ydb.
        at org.apache.derby.iapi.error.StandardException.newException(Unknown Source)
        at org.apache.derby.impl.store.raw.data.BaseDataFileFactory.privGetJBMSLockOnDB(Unknown Sour
ce)
        at org.apache.derby.impl.store.raw.data.BaseDataFileFactory.run(Unknown Source)
        at java.security.AccessController.doPrivileged(Native Method)
        at org.apache.derby.impl.store.raw.data.BaseDataFileFactory.getJBMSLockOnDB(Unknown Source)
        at org.apache.derby.impl.store.raw.data.BaseDataFileFactory.boot(Unknown Source)
        at org.apache.derby.impl.services.monitor.BaseMonitor.boot(Unknown Source)
        at org.apache.derby.impl.services.monitor.TopService.bootModule(Unknown Source)
        at org.apache.derby.impl.services.monitor.BaseMonitor.startModule(Unknown Source)
        at org.apache.derby.iapi.services.monitor.Monitor.bootServiceModule(Unknown Source)
        at org.apache.derby.impl.store.raw.RawStore.boot(Unknown Source)
        at org.apache.derby.impl.services.monitor.BaseMonitor.boot(Unknown Source)
        at org.apache.derby.impl.services.monitor.TopService.bootModule(Unknown Source)
        at org.apache.derby.impl.services.monitor.BaseMonitor.startModule(Unknown Source)
        at org.apache.derby.iapi.services.monitor.Monitor.bootServiceModule(Unknown Source)
        at org.apache.derby.impl.store.access.RAMAccessManager.boot(Unknown Source)
        at org.apache.derby.impl.services.monitor.BaseMonitor.boot(Unknown Source)
        at org.apache.derby.impl.services.monitor.TopService.bootModule(Unknown Source)
        at org.apache.derby.impl.services.monitor.BaseMonitor.startModule(Unknown Source)
        at org.apache.derby.iapi.services.monitor.Monitor.bootServiceModule(Unknown Source)
        at org.apache.derby.impl.db.BasicDatabase.bootStore(Unknown Source)
        at org.apache.derby.impl.db.BasicDatabase.boot(Unknown Source)
        at org.apache.derby.impl.services.monitor.BaseMonitor.boot(Unknown Source)
        at org.apache.derby.impl.services.monitor.TopService.bootModule(Unknown Source)
        at org.apache.derby.impl.services.monitor.BaseMonitor.bootService(Unknown Source)
        at org.apache.derby.impl.services.monitor.BaseMonitor.startProviderService(Unknown Source)
        at org.apache.derby.impl.services.monitor.BaseMonitor.findProviderAndStartService(Unknown So
urce)
        at org.apache.derby.impl.services.monitor.BaseMonitor.startPersistentService(Unknown Source)

        at org.apache.derby.iapi.services.monitor.Monitor.startPersistentService(Unknown Source)
        ... 25 more

似乎另一个 JVM 的应用程序锁定了 derby db。但是除了tomcat本身之外，我没有任何东西可以访问数据库。而且我目前还没有部署管理 web 应用程序。我只部署了使用 tomcat 登录的应用程序。有人知道发生了什么吗？

顺便说一句...为了从管理员 webapp 访问数据库，此解决方案是否正确？还是需要在 context.xml 中定义资源？

任何有帮助的答案都会被投票

谢谢

【参考方案1】：

单个 Tomcat 应用程序服务器中的每个单独的应用程序都被视为一个单独的 Derby 实例。

所以同一个 Tomcat 应用服务器中的两个不同应用程序无法访问同一个 Derby 副本，除非您使用 Derby 的 Client-Server 配置并配置一个 Derby Network Server。

【讨论】：

谢谢你回答我布莱恩！而且..如果访问derby db的元素是tomcat身份验证和管理db的应用程序，这种情况是否被视为单独的实例？换句话说......在我的情况下是否必须使用德比网络？非常感谢。