Question

我是H2数据库的新手，我遇到了一个特殊的问题，我正在运行一个名为format的函数。

public static String format(Double sumValue,Integer decimalValue){
 if(sumValue==null)
   return null;
 else{
      //format in particular order.
      }
}

sumValue有可能获得空值。

当我运行查询时，它会抛出以下异常

SELECT format(commamount,2) as formatted FROM pshipcommdetail [90105-153] 
    at org.h2.message.DbException.getJdbcSQLException(DbException.java:327) 
    at org.h2.message.DbException.get(DbException.java:156) 
    at org.h2.message.DbException.convertInvocation(DbException.java:295) 
    at org.h2.engine.FunctionAlias$JavaMethod.getValue(FunctionAlias.java:405) 
    at org.h2.expression.JavaFunction.getValue(JavaFunction.java:38) 
    at org.h2.expression.Alias.getValue(Alias.java:35) 
    at org.h2.command.dml.Select.queryFlat(Select.java:519) 
    at org.h2.command.dml.Select.queryWithoutCache(Select.java:614) 
    at org.h2.command.dml.Query.query(Query.java:269) 
    at org.h2.command.dml.Query.query(Query.java:239) 
    at org.h2.command.dml.Query.query(Query.java:37) 
    at org.h2.command.CommandContainer.query(CommandContainer.java:78) 
    at org.h2.command.Command.executeQuery(Command.java:181) 
    at org.h2.server.TcpServerThread.process(TcpServerThread.java:278) 
    at org.h2.server.TcpServerThread.run(TcpServerThread.java:137) 
    at java.lang.Thread.run(Unknown Source) 
Caused by: java.lang.NullPointerException 
    at reports.functions.Format.format(Format.java:15) 
    at sun.reflect.GeneratedMethodAccessor5.invoke(Unknown Source) 
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) 
    at java.lang.reflect.Method.invoke(Unknown Source) 
    at org.h2.engine.FunctionAlias$JavaMethod.getValue(FunctionAlias.java:393)

我经历了documentation，并且能够弄清楚这些结果应该是包装类，因此我改为加倍！

请有人帮我弄清楚实际问题在哪里吗？

感谢你

关心 Phani Kumar

Answer 1

在H2邮件列表上回答了这个问题： http://groups.google.com/group/h2-database/browse_thread/thread/a4105b923d79bf28# 这是Phani代码中的一个错误。

H2数据库抛出空指针异常

1 个答案: