我正在使用 Java EE Hibernate 5，最近我可以看到我的 Tomcat 9 日志中有一些錯誤訊息說：
java.lang.IllegalStateException: Transaction already active
問題涉及的方法有：
// The caller method
Pic p = picDAO.getById(1000);
// The Hibernate method
@Override
public Pic getById(Integer id) throws BDException {
Session session = sessionFactory.getCurrentSession();
Transaction tx = session.getTransaction();
try {
tx.begin();
Pic p = (Pic) session.get(myClass, id);
tx.commit();
return p;
}
catch(........) {
// Exceptions here
}
}
編輯。這是完整的堆疊跟蹤（一些訊息是西班牙語）：
12-Nov-2021 09:30:43.875 GRAVE [http-nio-8080-exec-10] org.apache.catalina.core.StandardWrapperValve.invoke Servlet.service() para servlet [ViewPic] lanzó excepción
java.lang.IllegalStateException: Transaction already active
at org.hibernate.engine.transaction.internal.TransactionImpl.begin(TransactionImpl.java:74)
at project.dao.DAOGeneric.getById(DAOGeneric.java:268)
at project.controller.forwards.ViewPic.processRequest(ViewPic.java:86)
at project.controller.MainServlet.doGet(MainServlet.java:38)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:655)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:764)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:227)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162)
at project.controller.filters.TileConfigFilter.doFilter(TileConfigFilter.java:58)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:197)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:97)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:540)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:135)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:78)
at org.apache.catalina.valves.RemoteIpValve.invoke(RemoteIpValve.java:769)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:357)
at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:382)
at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65)
at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:895)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1722)
at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
at org.apache.tomcat.util.threads.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1191)
at org.apache.tomcat.util.threads.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:659)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.base/java.lang.Thread.run(Thread.java:829)
uj5u.com熱心網友回復：
我已經查看了堆疊跟蹤，嗯……它說一個事務已經處于活動狀態，而您正在嘗試打開一個新的事務。
這個已經激活的交易在哪里打開呢？
at org.hibernate.engine.transaction.internal.TransactionImpl.begin(TransactionImpl.java:74)
at project.dao.DAOGeneric.getById(DAOGeneric.java:268)
at project.controller.forwards.ViewPic.processRequest(ViewPic.java:86)
at project.controller.MainServlet.doGet(MainServlet.java:38)
它必須在這里的某處打開（下面的所有內容都是系統類并且不受您控制）顯式（通過方法呼叫）或隱式（@Transactional 注釋或類似）
您可以找到這種和平的代碼，它在您呼叫方法之前打開事務并洗掉它。或者您可以更改您的代碼，以便它可以通過執行此類操作來加入現有事務。
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