错误笔记

1，操作数据库时连接使用完未放回到连接池。

<Error> <HTTP> <BEA-101020> <[ServletContext@1095785628[app:cpicgxwx module:cpicgxwx.war path:/cpicgxwx spec-version:2.5]] Servlet failed with Exception

org.hibernate.exception.GenericJDBCException: Could not open connection         at org.hibernate.exception.internal.StandardSQLExceptionConverter.convert(StandardSQLExceptionConverter.java:54)         at org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:125)         at org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:110)         at org.hibernate.engine.jdbc.internal.LogicalConnectionImpl.obtainConnection(LogicalConnectionImpl.java:304)         at org.hibernate.engine.jdbc.internal.LogicalConnectionImpl.getConnection(LogicalConnectionImpl.java:169)         Truncated. see log file for complete stacktrace Caused By: weblogic.jdbc.extensions.PoolLimitSQLException: weblogic.common.resourcepool.ResourceLimitException: No resources currently available in pool gxwx to allocate to applications, please increase the size of the pool and retry..         at weblogic.jdbc.common.internal.JDBCUtil.wrapAndThrowResourceException(JDBCUtil.java:252)         at weblogic.jdbc.pool.Driver.connect(Driver.java:161)         at weblogic.jdbc.jts.Driver.getNonTxConnection(Driver.java:651)         at weblogic.jdbc.jts.Driver.connect(Driver.java:127)         at weblogic.jdbc.common.internal.RmiDataSource.getConnection(RmiDataSource.java:364)

        Truncated. see log file for complete stacktrace

解决：

        检查程序在每次使用完连接是否放回了，可以重启一下看看是否运行正常。

        设置里同时连接个数太小，看看设置 ，增加同时连接个数。

2，

    decodewxticket:null java.lang.StringIndexOutOfBoundsException: String index out of range: 17         at java.lang.String.substring(String.java:1934)         at com.aptech.util.DeEnCode.isValidTicket(DeEnCode.java:22)         at ywhb.VerifyNetSaleEmpServlet.doPost(VerifyNetSaleEmpServlet.java:55)         at ywhb.VerifyNetSaleEmpServlet.doGet(VerifyNetSaleEmpServlet.java:35)         at javax.servlet.http.HttpServlet.service(HttpServlet.java:707)         at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)         at weblogic.servlet.internal.StubSecurityHelper$ServletServiceAction.run(StubSecurityHelper.java:227)

在操作字符串时使用str.substring（2,17）报错

str为null；使用时注意字符串长度，并作非空处理。