防止 WildFly 过早解除绑定数据源

Question

我在一个 WildFly 实例中有两个 web 应用程序。

两者都使用自己的数据源——每个都在standalone.xml 中定义。定义看起来完全一样：

<datasource jndi-name="java:/jdbc/ds-a" pool-name="pool-a" enabled="true" use-java-context="true">
    ...
</datasource>

<datasource jndi-name="java:/jdbc/ds-b" pool-name="pool-b" enabled="true" use-java-context="true">
    ...
</datasource>

第一个 webapp A 使用 Hibernate 和 persistence.xml：

<persistence-unit name="database">
    <jta-data-source>java:/jdbc/ds-a</jta-data-source>
    ...
</persistence-unit>

第二个 webapp B 正在使用 JNDI 查找：

DataSource ds = context.lookup("jdbc/ds-b")

一切正常，除了在关闭期间两个 web 应用程序都在执行一些清理任务。虽然 webapp A 在关闭期间仍然能够访问其数据源，但 webapp B 的数据源已经关闭。

这是一个日志示例：

[org.jboss.as.server] (Management Triggered Shutdown) WFLYSRV0241: Shutting down in response to management operation 'shutdown'
[org.jboss.as.connector.subsystems.datasources] (MSC service thread 1-2) WFLYJCA0010: Unbound data source [java:/jdbc/ds-b]
[org.jboss.jca.core.connectionmanager.pool.strategy.OnePool] (ServerService Thread Pool -- 135) IJ000615: Destroying active connection in pool: pool-b (org.jboss.jca.adapters.jdbc.local.LocalManagedConnection@...)
[org.hibernate.util.JDBCExceptionReporter] (webappb/scheduler_dispatch-3) javax.resource.ResourceException: IJ000470: You are trying to use a connection factory that has been shut down: java:/jdbc/ds-b

...

[org.jboss.as.jpa] (ServerService Thread Pool -- 139) WFLYJPA0011: Stopping Persistence Unit (phase 1 of 2) Service 'webappa.war#database'
[org.jboss.as.connector.subsystems.datasources] (MSC service thread 1-6) WFLYJCA0010: Unbound data source [java:/jdbc/ds-a]
[org.jboss.as.server.deployment] (MSC service thread 1-4) WFLYSRV0028: Stopped deployment webappa.war (runtime-name: webappa.war) in 822ms

... many "javax.resource.ResourceException: IJ000470: You are trying to use a connection factory that has been shut down: java:/jdbc/ds-b" ....

[org.jboss.as.connector.subsystems.datasources] (MSC service thread 1-1) WFLYJCA0010: Unbound data source [java:jboss/datasources/ExampleDS]
[org.jboss.as.connector.deployers.jdbc] (MSC service thread 1-7) WFLYJCA0019: Stopped Driver service with driver-name = h2
[org.jboss.as.clustering.infinispan] (ServerService Thread Pool -- 161) WFLYCLINF0003: Stopped http-remoting-connector cache from ejb container
[org.infinispan.manager.DefaultCacheManager] (ServerService Thread Pool -- 161) Stopping cache manager null on null
[org.wildfly.extension.undertow] (MSC service thread 1-6) WFLYUT0019: Host default-host stopping
[org.wildfly.extension.undertow] (MSC service thread 1-6) WFLYUT0008: Undertow HTTP listener default suspending
[org.wildfly.extension.undertow] (MSC service thread 1-6) WFLYUT0007: Undertow HTTP listener default stopped, was bound to 127.0.0.1:8080
[org.wildfly.extension.undertow] (MSC service thread 1-4) WFLYUT0008: Undertow HTTPS listener https suspending
[org.wildfly.extension.undertow] (MSC service thread 1-4) WFLYUT0007: Undertow HTTPS listener https stopped, was bound to 127.0.0.1:8443
[org.wildfly.extension.undertow] (MSC service thread 1-7) WFLYUT0004: Undertow 2.2.3.Final stopping
[org.jboss.as.server.deployment] (MSC service thread 1-2) WFLYSRV0028: Stopped deployment webappb.war (runtime-name: webappb.war) in 72112ms

可以看到，数据源ds-b立即解除绑定，而WildFly等到A的持久化单元关闭后，数据源ds -a 未绑定。

如何防止 WildFly 在 webapp-b 被取消部署之前解除绑定数据源？

Answer 1

你应该告诉 WildFly 这个依赖并在你的 Webapp 的web.xml 中添加一个resource-ref B：

<web-app>
    ...
    <resource-ref>
        <description>My database reference</description>
        <res-ref-name>jdbc/my-db</res-ref-name>
    </resource-ref>
</web-app>

并在您的jboss-web.xml 中添加resource-ref：

<jboss-web>
    ...
    <resource-ref>
        <res-ref-name>jdbc/my-db</res-ref-name>
        <jndi-name>java:/jdbc/ds-b</jndi-name>
    </resource-ref>
</jboss-web>

然后您可以使用jdbc/my-db 或jdbc/ds-b 查找数据源。