JDBC_PING java.sql.SQLException: ORA-00001: unique constraint violated ---------------------------------------------------------------------- Key: JGRP-1440 URL: https://issues.jboss.org/browse/JGRP-1440 Project: JGroups Issue Type: Bug Affects Versions: 2.12.1 Environment: windows xp, oracle 11G Reporter: freeliuade freeliuade Assignee: Sanne Grinovero Labels: JDBC_PING, Fix For: 3.1 Original Estimate: 1 week Remaining Estimate: 1 week using JDBC_PING, create a very simple JChannel, unique constraint violated exception will throw sometimes. it's a occationally issue. to easy reproduce it, using debug to let threads hold on JDBC_PING.writeToFile(...). line insert(...) (JDBC_PING line 246 in JGroups2.12.1.Final) you can find three threads will be hold on here. then using debug to step over this line, the unique constraint violated exception will throw. I uploaded a debug diagram in here http://ww2.sinaimg.cn/mw600/649a9869jw1dr8m399uqdj.jpg following is the exception stack: SEVERE: Error updating JDBC_PING table java.sql.SQLException: ORA-00001: unique constraint (HLIUCLUSTER.SYS_C0038277) violated at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:112) at oracle.jdbc.driver.T4CTTIoer.processError(T4CTTIoer.java:331) at oracle.jdbc.driver.T4CTTIoer.processError(T4CTTIoer.java:288) at oracle.jdbc.driver.T4C8Oall.receive(T4C8Oall.java:745) at oracle.jdbc.driver.T4CPreparedStatement.doOall8(T4CPreparedStatement.java:219) at oracle.jdbc.driver.T4CPreparedStatement.executeForRows(T4CPreparedStatement.java:970) at oracle.jdbc.driver.OracleStatement.doExecuteWithTimeout(OracleStatement.java:1190) at oracle.jdbc.driver.OraclePreparedStatement.executeInternal(OraclePreparedStatement.java:3370) at oracle.jdbc.driver.OraclePreparedStatement.executeUpdate(OraclePreparedStatement.java:3454) at org.jgroups.protocols.JDBC_PING.insert(JDBC_PING.java:265) at org.jgroups.protocols.JDBC_PING.writeToFile(JDBC_PING.java:246) at org.jgroups.protocols.FILE_PING.sendGetMembersRequest(FILE_PING.java:115) at org.jgroups.protocols.Discovery$PingSenderTask$1.run(Discovery.java:527) at org.jgroups.util.TimeScheduler2$RecurringTask.run(TimeScheduler2.java:592) at org.jgroups.util.TimeScheduler2$MyTask.run(TimeScheduler2.java:524) at org.jgroups.util.TimeScheduler2$Entry.execute(TimeScheduler2.java:429) at org.jgroups.util.TimeScheduler2$1.run(TimeScheduler2.java:295) at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908) at java.lang.Thread.run(Thread.java:619)