H2數據庫拋出空指針異常

Question

我是新的H2數據庫，我遇到了一個特定的問題，我運行一個名爲格式的函數。

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

sumValue有空值的機會。

當我運行一個查詢它拋出以下異常

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) 

我通過documentation去，並能計算出該aruguments應該是包裝類的，因此我改變了一倍！

你們中的任何人都可以幫我弄清楚實際問題在哪裏嗎？

感謝你

與問候 Phani庫馬爾

Answer 1

這個問題得到回答的H2郵件列表： http://groups.google.com/group/h2-database/browse_thread/thread/a4105b923d79bf28# 正是在Phani的代碼中的錯誤。