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Java Forum / General / November 2006

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how to convert BigInteger to integer

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varma.chiru@gmail.com - 29 Nov 2006 12:46 GMT
hi,

When i am trying to retrieve resultset from database i am getting
ClassCastException i.e.
java.math.BigInteger.Here actually iam using EJB3.0.in database the
datatype of the
column is 'bigint'.but when i am trying to retrieve resultset by using
EntityManager's createNativeQuery its giving this exception.

javax.ejb.EJBException: java.lang.ClassCastException:
java.math.BigInteger
    at
org.jboss.ejb3.tx.Ejb3TxPolicy.handleExceptionInOurTx(Ejb3TxPolicy.java:69)
    at org.jboss.aspects.tx.TxPolicy.invokeInOurTx(TxPolicy.java:83)
    at
org.jboss.aspects.tx.TxInterceptor$Required.invoke(TxInterceptor.java:192)
    at
org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:98)
    at
org.jboss.aspects.tx.TxPropagationInterceptor.invoke(TxPropagationInterceptor.java:76)
    at
org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:98)
    at
org.jboss.ejb3.stateless.StatelessInstanceInterceptor.invoke(StatelessInstanceInterceptor.java:54)
    at
org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:98)
    at
org.jboss.aspects.security.AuthenticationInterceptor.invoke(AuthenticationInterceptor.java:78)
    at
org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:98)
    at
org.jboss.ejb3.ENCPropagationInterceptor.invoke(ENCPropagationInterceptor.java:47)
    at
org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:98)
    at
org.jboss.ejb3.asynchronous.AsynchronousInterceptor.invoke(AsynchronousInterceptor.java:106)
    at
org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:98)
    at
org.jboss.ejb3.stateless.StatelessContainer.dynamicInvoke(StatelessContainer.java:225)
    at org.jboss.aop.Dispatcher.invoke(Dispatcher.java:104)
    at
org.jboss.aspects.remoting.AOPRemotingInvocationHandler.invoke(AOPRemotingInvocationHandler.java:82)
    at org.jboss.remoting.ServerInvoker.invoke(ServerInvoker.java:828)
    at org.jboss.remoting.ServerInvoker.invoke(ServerInvoker.java:681)
    at
org.jboss.remoting.transport.socket.ServerThread.processInvocation(ServerThread.java:358)
    at
org.jboss.remoting.transport.socket.ServerThread.dorun(ServerThread.java:412)
    at
org.jboss.remoting.transport.socket.ServerThread.run(ServerThread.java:239)
Caused by: java.lang.ClassCastException: java.math.BigInteger
    at
com.hqs.ppsadvantage.ejb.PatientSearchBean.searchPatientByPrimaryAndSecondary(Unknown
Source)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
    at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:585)
    at
org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:109)
    at
org.jboss.ejb3.entity.TransactionScopedEntityManagerInterceptor.invoke(TransactionScopedEntityManagerInterceptor.java:54)
    at
org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:98)
    at
org.jboss.ejb3.AllowedOperationsInterceptor.invoke(AllowedOperationsInterceptor.java:47)
    at
org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:98)
    at org.jboss.aspects.tx.TxPolicy.invokeInOurTx(TxPolicy.java:79)
    at
org.jboss.aspects.tx.TxInterceptor$Required.invoke(TxInterceptor.java:192)
    at
org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:98)
    at
org.jboss.aspects.tx.TxPropagationInterceptor.invoke(TxPropagationInterceptor.java:76)
    at
org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:98)
    at
org.jboss.ejb3.stateless.StatelessInstanceInterceptor.invoke(StatelessInstanceInterceptor.java:54)
    at
org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:98)
    at
org.jboss.aspects.security.AuthenticationInterceptor.invoke(AuthenticationInterceptor.java:78)
    at
org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:98)
    at
org.jboss.ejb3.ENCPropagationInterceptor.invoke(ENCPropagationInterceptor.java:47)
    at
org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:98)
    at
org.jboss.ejb3.asynchronous.AsynchronousInterceptor.invoke(AsynchronousInterceptor.java:106)
    at
org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:98)
    at
org.jboss.ejb3.stateless.StatelessContainer.dynamicInvoke(StatelessContainer.java:225)
    at org.jboss.aop.Dispatcher.invoke(Dispatcher.java:104)
    at
org.jboss.aspects.remoting.AOPRemotingInvocationHandler.invoke(AOPRemotingInvocationHandler.java:82)
    at org.jboss.remoting.ServerInvoker.invoke(ServerInvoker.java:828)
    at org.jboss.remoting.ServerInvoker.invoke(ServerInvoker.java:681)
    at
org.jboss.remoting.transport.socket.ServerThread.processInvocation(ServerThread.java:358)
    at
org.jboss.remoting.transport.socket.ServerThread.dorun(ServerThread.java:412)
    at
org.jboss.remoting.transport.socket.ServerThread.run(ServerThread.java:239)
    at
org.jboss.remoting.RemoteClientInvoker.invoke(RemoteClientInvoker.java:190)
    at org.jboss.remoting.Client.invoke(Client.java:525)
    at org.jboss.remoting.Client.invoke(Client.java:488)
    at
org.jboss.aspects.remoting.InvokeRemoteInterceptor.invoke(InvokeRemoteInterceptor.java:55)
    at
org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:98)
    at
org.jboss.aspects.tx.ClientTxPropagationInterceptor.invoke(ClientTxPropagationInterceptor.java:61)
    at
org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:98)
    at
org.jboss.aspects.security.SecurityClientInterceptor.invoke(SecurityClientInterceptor.java:55)
    at
org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:98)
    at
org.jboss.ejb3.remoting.IsLocalInterceptor.invoke(IsLocalInterceptor.java:65)
    at
org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:98)
    at
org.jboss.ejb3.stateless.StatelessRemoteProxy.invoke(StatelessRemoteProxy.java:102)
    at $Proxy2.searchPatientByPrimaryAndSecondary(Unknown Source)
    at com.hqs.ppsadvantage.bo.SearchBO.searchPatient(Unknown Source)
    at com.hqs.ppsadvantage.utils.TestSearchBO.main(Unknown Source)
Reply to this Message
Hendrik Maryns - 29 Nov 2006 15:32 GMT
varma.chiru@gmail.com schreef:
> hi,
>
[quoted text clipped - 7 lines]
> javax.ejb.EJBException: java.lang.ClassCastException:
> java.math.BigInteger

It seems like you try to convert a BigInteger to an Integer by casting.
like this:

Integer i = (Integer) someThingThatIsABigInt()

That will not work, because BigInteger is no subclass or superclass of
Integer.  There are, however, the methods intValue(), longValue and
floatValue(), which can then be used to get an Integer.  But probably,
you just want an int.  That would be much clearer *if you had posted
some code*.

HTH, H.
- --
Hendrik Maryns
http://tcl.sfs.uni-tuebingen.de/~hendrik/
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