我正在使用tomcat 6和postgresql 8.4。我的代码如下:
try {
// Prepared statement inserting something...
} catch (final PSQLException e) {
LOG.log(Level.SEVERE, "Saving failed.", e);
} catch (final SQLException e) {
LOG.log(Level.SEVERE, "Saving failed (SQL).", e);
}
这个插入到db可能会导致psqlexception(例如,一个唯一的密钥冲突),我想用第一个
catch
捕获它。然而,我在日志中发现的是:SEVERE: Saving failed (SQL).
org.postgresql.util.PSQLException: ERROR: duplicate key value violates unique constraint "UZIVATELIA_U_LOGIN"
at org.postgresql.core.v3.QueryExecutorImpl.receiveErrorResponse(QueryExecutorImpl.java:2102)
at org.postgresql.core.v3.QueryExecutorImpl.processResults(QueryExecutorImpl.java:1835)
at org.postgresql.core.v3.QueryExecutorImpl.execute(QueryExecutorImpl.java:257)
at org.postgresql.jdbc2.AbstractJdbc2Statement.execute(AbstractJdbc2Statement.java:500)
at org.postgresql.jdbc2.AbstractJdbc2Statement.executeWithFlags(AbstractJdbc2Statement.java:388)
at org.postgresql.jdbc2.AbstractJdbc2Statement.executeQuery(AbstractJdbc2Statement.java:273)
at org.apache.commons.dbcp.DelegatingPreparedStatement.executeQuery(DelegatingPreparedStatement.java:96)
at org.apache.commons.dbcp.DelegatingPreparedStatement.executeQuery(DelegatingPreparedStatement.java:96)
at cz.ecoremedia.realpad.web.backend.Users.saveNewUser(Users.java:119)
at cz.ecoremedia.realpad.web.backend.Users.saveUser(Users.java:237)
at org.apache.jsp.User_jsp._jspService(User_jsp.java:159)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:388)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:313)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:260)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
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:859)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:602)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
at java.lang.Thread.run(Thread.java:662)
如果我检查捕获的
e
类型,例如:} catch (final SQLException e) {
LOG.log(Level.SEVERE, e.getClass().getName());
LOG.log(Level.SEVERE, "Saving failed (SQL).", e);
它仍然告诉我它是
org.postgresql.util.PSQLException
。当我在eclipse中本地尝试此方法时,它工作得很好-
PSQLException
在第一个catch
块中被正确捕获。如果我正确地理解了这个问题,那么我捕获的
org.postgresql.util.PSQLException
与实际抛出的org.postgresql.util.PSQLException
是不同的类。这怎么可能?我做错什么了?谢谢你的意见。
最佳答案
结果,我在tomcat的lib/
文件夹中有另一个jdbc驱动程序,除了WEB-INF/lib/
中的那个。移除Tomcat的一个修复了我的问题。
(是的,这是一个不同的类装入器问题,谢谢@nathanhughes。)