How to catch SQLException in CMP bean

Hi there,
I am using CMP beans to set columns, one of which has referential integrity.
Because the abstract set() method does not declare to throw SQLException, I
can not catch SQLException in my session bean (which calls local CMP bean
for creating and setting entity beans), the compiler complains "unreachable
block".
I can only try catching RemoteException in my delegate class. I do not like
that, I even tried to catch all exceptions, i.e., catch Exception, in my
session bean, I still did not catch the SQLException.
The update calls are made into DB probably right before the transaction
completes, however, since it is the container generated classes that does DB
calls and throw SQLException, I could not catch it there since I do not have
the source code for generated classes.
Call stack is attached.
Any suggestion is welcome. Basically I would like to catch SQLException in
session bean.
Thanks.
Yan
<Oct 18, 2004 10:09:06 AM EDT> <Error> <EJB> <BEA-010026> <Exception
occurred during commit of transaction Name=[EJB com.med
lus.serviceHub.rx.ejb.pharmacy.PharmacyMgrSession.updatePharmacy(java.util.A
rrayList,long,java.lang.String)],Xid=BEA1-0153A4
2892EE25246C3(29499284),Status=Rolled back.
[Reason=weblogic.utils.NestedRuntimeException: Error writing from
beforeCompleti
n - with nested exception:
[java.sql.SQLException: ORA-02291: integrity constraint
(DX_OWNER.STATEABBR_RXPHARM_FK) violated - parent key not found
]],numRepliesOwedMe=0,numRepliesOwedOthers=0,seconds since begin=0,seconds
left=30,XAServerResourceInfo[weblogic.jdbc.wrappe
.JTSXAResourceImpl]=(ServerResourceInfo[weblogic.jdbc.wrapper.JTSXAResourceI
mpl]=(state=rolledback,assigned=myserver),xar=we
logic.jdbc.wrapper.JTSXAResourceImpl@1a7491e,re-Registered =
false),SCInfo[hubservices+myserver]=(state=rolledback),properti
s=({weblogic.transaction.name=[EJB
com.medplus.serviceHub.rx.ejb.pharmacy.PharmacyMgrSession.updatePharmacy(jav
a.util.ArrayL
st,long,java.lang.String)], weblogic.jdbc=t3://172.18.15.54:7001}),local
properties=({modifiedListeners=[weblogic.ejb20.inte
nal.TxManager$TxListener@71de6e]}),OwnerTransactionManager=ServerTM[ServerCo
ordinatorDescriptor=(CoordinatorURL=myserver+172
18.15.54:7001+hubservices+t3+,
XAResources={},NonXAResources={})],CoordinatorURL=myserver+172.18.15.54:7001
hubservicest3+)
java.sql.SQLException: ORA-02291: integrity constraint
(DX_OWNER.STATEABBR_RXPHARM_FK) violated - parent key not found
at
oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:125)
at oracle.jdbc.driver.T4CTTIoer.processError(T4CTTIoer.java:305)
at oracle.jdbc.driver.T4CTTIoer.processError(T4CTTIoer.java:272)
at oracle.jdbc.driver.T4C8Oall.receive(T4C8Oall.java:623)
at
oracle.jdbc.driver.T4CPreparedStatement.doOall8(T4CPreparedStatement.java:18
1)
at
oracle.jdbc.driver.T4CPreparedStatement.execute_for_rows(T4CPreparedStatemen
t.java:543)
at
oracle.jdbc.driver.OracleStatement.doExecuteWithTimeout(OracleStatement.java
:1027)
at
oracle.jdbc.driver.OraclePreparedStatement.executeInternal(OraclePreparedSta
tement.java:2885)
at
oracle.jdbc.driver.OraclePreparedStatement.executeUpdate(OraclePreparedState
ment.java:2957)
at
weblogic.jdbc.wrapper.PreparedStatement.executeUpdate(PreparedStatement.java
:115)
at
com.medplus.serviceHub.rx.ejb.pharmacy.Pharmacy_i7s2ww__WebLogic_CMP_RDBMS._
WLstore(Pharmacy_i7s2ww__WebLogic_C
P_RDBMS.java:3564)
at
com.medplus.serviceHub.rx.ejb.pharmacy.Pharmacy_i7s2ww__WebLogic_CMP_RDBMS.e
jbStore(Pharmacy_i7s2ww__WebLogic_CMP
RDBMS.java:3390)
at
weblogic.ejb20.manager.DBManager.beforeCompletion(DBManager.java:965)
at
weblogic.ejb20.internal.TxManager$TxListener.beforeCompletion(TxManager.java
:653)
at
weblogic.transaction.internal.ServerSCInfo.callBeforeCompletions(ServerSCInf
o.java:1010)
at
weblogic.transaction.internal.ServerSCInfo.startPrePrepareAndChain(ServerSCI
nfo.java:115)
at
weblogic.transaction.internal.ServerTransactionImpl.localPrePrepareAndChain(
ServerTransactionImpl.java:1184)
at
weblogic.transaction.internal.ServerTransactionImpl.globalPrePrepare(ServerT
ransactionImpl.java:1910)
at
weblogic.transaction.internal.ServerTransactionImpl.internalCommit(ServerTra
nsactionImpl.java:273)
at
weblogic.transaction.internal.ServerTransactionImpl.commit(ServerTransaction
Impl.java:244)
at
weblogic.ejb20.internal.BaseEJBObject.postInvoke(BaseEJBObject.java:299)
at
weblogic.ejb20.internal.StatelessEJBObject.postInvoke(StatelessEJBObject.jav
a:140)
at
com.medplus.serviceHub.rx.ejb.pharmacy.PharmacyMgr_kb6mwa_EOImpl.updatePharm
acy(PharmacyMgr_kb6mwa_EOImpl.java:16
at
com.medplus.serviceHub.rx.ejb.pharmacy.PharmacyMgr_kb6mwa_EOImpl_WLSkel.invo
ke(Unknown Source)
at
weblogic.rmi.internal.BasicServerRef.invoke(BasicServerRef.java:477)
at
weblogic.rmi.cluster.ReplicaAwareServerRef.invoke(ReplicaAwareServerRef.java
:108)
at
weblogic.rmi.internal.BasicServerRef$1.run(BasicServerRef.java:420)
at
weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubjec
t.java:363)
at
weblogic.security.service.SecurityManager.runAs(SecurityManager.java:144)
at
weblogic.rmi.internal.BasicServerRef.handleRequest(BasicServerRef.java:415)
at
weblogic.rmi.internal.BasicExecuteRequest.execute(BasicExecuteRequest.java:3
0)
at weblogic.kernel.ExecuteThread.execute(ExecuteThread.java:219)
at weblogic.kernel.ExecuteThread.run(ExecuteThread.java:178)
--------------- nested within: ------------------

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     at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:151)
     at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:564)
     at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:195)
     at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:151)
     at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:164)
     at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:149)
     at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:564)
     at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:156)
     at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:151)
     at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:564)
     at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:972)
     at org.apache.coyote.tomcat5.CoyoteAdapter.service(CoyoteAdapter.java:206)
     at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:828)
     at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:700)
     at org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:584)
     at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:683)
     at java.lang.Thread.run(Unknown Source)
now I want to catch it.but I cannot make sure if I can ONLY catch this Exception but not others.who can help me?Thanks.

try {
     con = DriverManager.getConnection("jdbc:mysql://computerName/databaseName",userName,password);
     stmt = con.createStatement();
     return true;
     catch(SQLException ex) {
     if(ex.getMessage().toUpperCase().compareTo("SERVER CONFIGURATION DENIES ACCESS TO DATA SOURCE")==0)
          createErrorWindow("Somebody is already logged in, please try again later");
     else
          createErrorWindow("Error establishing connection to remote machine!");
     return false;
I do this do decide between different types of SQLExceptions - use exception.getMessage() and compare the string returned.
Steve.

Error in deploying a cmp bean in j2ee 1.3

Hi,
I am deploying a cmr application using 3 cmp entity beans. while deloyment i get a error for one of the entity bean, studentEJB. the error is :
For [ StudentEJB ]
Error: There are no method permissions within this bean [ StudentEJB ]. Transaction attributes must be specified for the methods defined in the remote interface [ LocalStudent ]. Method [ getLastName ] has no transaction attribute defined.
my LocalStudent file is:
import javax.ejb.*;
import java.util.*;
public interface LocalStudent extends EJBLocalObject
public String getStudentID();
public String getFirstName();
public String getLastName();
public ArrayList getAddressList();
public ArrayList getRosterList();
public void addAddress(LocalAddress address);
public void addRoster(LocalRoster roster);
while no errors are coming for the studentID and firstName fields why is the error coming for lastName field ?
three fields, studentID, firstName and lastName contain similar implementations in the LocalStudent and studentEJB class.
wiating for an early response...
Tanmoy

Hello there!
I am having a similar problem here also. I am trying to build a lab for test the J2EE tecnology in order for the company I work for switch our Cash Dispenser system to java.
I have made a very simple entity EJB witch local interface is:
public interface LabLocal extends EJBLocalObject
String getExperiment();
String getDescription();
void setDescription(String description);
String getResult();
void setResult(String result);
Local home is:
public interface LabLocalHome extends EJBLocalHome
     LabLocal create( String experiment, String description, String result ) throws CreateException;
     LabLocal findByPrimaryKey( LabPK key ) throws FinderException;
     void remove();
and the bean itself is:
public class LabBean implements EntityBean
private EntityContext ctx;
private DataSource dataSource;
public String experiment;
public String description;
public String result;
/* (non-Javadoc)
* @see javax.ejb.EntityBean#ejbActivate()
public void ejbActivate() throws EJBException, RemoteException
// nothing to do here people.
/* (non-Javadoc)
* @see javax.ejb.EntityBean#ejbLoad()
public void ejbLoad() throws EJBException, RemoteException
LabPK key = (LabPK)ctx.getPrimaryKey();
Connection con = null;
PreparedStatement stmt = null;
ResultSet rs = null;
try
con = dataSource.getConnection();
stmt = con.prepareStatement("SELECT description, result FROM laboratory WHERE experiment = ?");
stmt.setString(1, key.experiment);
rs = stmt.executeQuery();
if( ! rs.next() )
error( "no data found in ejbLoad for " + key, null);
this.experiment = key.experiment;
catch( SQLException se)
error("Error in ejbLoad" + key, se);
finally
closeConnection(con, stmt, rs);
/* (non-Javadoc)
* @see javax.ejb.EntityBean#ejbPassivate()
public void ejbPassivate() throws EJBException, RemoteException
this.description = null;
this.result = null;
this.experiment = null;
/* (non-Javadoc)
* @see javax.ejb.EntityBean#ejbRemove()
public void ejbRemove() throws RemoveException, EJBException, RemoteException
     LabPK key = (LabPK) ctx.getPrimaryKey();
     Connection con = null;
     PreparedStatement stmt = null;
     try
          con = dataSource.getConnection();
          stmt = con.prepareStatement("DELETE FROM laboratory WHERE experiment = ? ");
          stmt.setString(1, key.toString() );
          stmt.executeUpdate();
     catch( SQLException se )
          error( "Error deleting " + key, se );
     finally
          closeConnection(con, stmt, null);
     this.experiment = null;
     this.description = null;
     this.result = null;
/* (non-Javadoc)
* @see javax.ejb.EntityBean#ejbStore()
public void ejbStore() throws EJBException, RemoteException
Connection con = null;
PreparedStatement stmt = null;
try
con = dataSource.getConnection();
stmt = con.prepareStatement("UPDATE Laboratory SET description = ? , result = ? WHERE experiment = ? ");
stmt.setString(1, this.description);
stmt.setString(2, this.result);
stmt.setString(3, this.experiment);
stmt.executeUpdate();
catch( SQLException se)
error( "Error processing UPDATE statement.", se);
finally
closeConnection(con, stmt, null);
/* (non-Javadoc)
* @see javax.ejb.EntityBean#unsetEntityContext()
public void unsetEntityContext() throws EJBException, RemoteException
this.ctx = null;
this.dataSource = null;
/* (non-Javadoc)
* @see javax.ejb.EntityBean#setEntityContext(javax.ejb.EntityContext)
public void setEntityContext(EntityContext arg0) throws EJBException, RemoteException
this.ctx = arg0;
InitialContext ic = null;
try
ic = new InitialContext();
dataSource = (DataSource) ic.lookup("java:comp/env/jdbc/teste");
catch( NamingException ne)
error( "error looking up depend EJB or resource. ", ne);
public void error( String message, Exception e)
throw new EJBException( message, e);
public void closeConnection( Connection con, PreparedStatement stmt, ResultSet rs )
try
     if( stmt != null )
     stmt.close();
catch( SQLException se)
System.out.println( "Data base error: " + se.toString() );
try
     if( con != null)
     con.close();
catch( SQLException se)
System.out.println( "Data base error: " + se.toString() );
public LabPK ejbCreate( String experiment, String description, String result ) throws CreateException
LabPK key = new LabPK( experiment );
try
ejbFindByPrimaryKey( key );
throw new CreateException( "Duplicate lab: " + key);
catch( FinderException fe ){}
Connection con = null;
PreparedStatement stmt = null;
try
con = dataSource.getConnection();
stmt = con.prepareStatement("INSERT INTO laboratory ( experiment, description, result ) VALUES (?, ?, ?) ");
stmt.setString(1, experiment);
stmt.setString(2, description);
stmt.setString(3, result);
catch( SQLException se )
error( "Error creating lab: " + key, se);
finally
closeConnection(con, stmt, null);
this.experiment = experiment;
this.description = description;
this.result = result;
return key;
public void ejbPostCreate(String experiment, String description, String result){}
public LabPK ejbFindByPrimaryKey( LabPK key ) throws FinderException
     Connection con = null;
     PreparedStatement stmt = null;
     ResultSet rs = null;
     try
          con = dataSource.getConnection();
          stmt = con.prepareStatement("SELECT experiment FROM laboratory WHERE experiment = ?");
          stmt.setString(1, key.experiment );
          rs = stmt.executeQuery();
          if( !rs.next() )
               throw new FinderException( "Unknown key: " + key );
          return key;
     catch( SQLException se )
          error( "Error in finding primary key for " + key, se );
     finally
     closeConnection(con, stmt, rs);
     return null;
public String getExperiment()
return this.experiment;
public String getDescription()
return this.description;
public void setDescription(String description)
this.description = description;
public String getResult()
return this.result;
public void setResult(String result)
this.result = result;
I will omit the PK code in order to not create a longer than necessary post.
I am using the deploytool�s Graphical interface to generate a standalone jar file. When I run the verify tool I get the following errors:
For [ D:-Linux-Java-LabJar.jar#LabJar.jar#LabBean ]
Error: There are no method permissions within this bean [ LabBean ]. Transaction attributes must be specified for the methods defined in the remote interface [ simpleEJB.LabLocal ]. Method [ getDescription ] has no transaction attribute defined.
For [ D:-Linux-Java-LabJar.jar#LabJar.jar#LabBean ]
Error: There are no method permissions within this bean [ LabBean ]. Transaction attributes must be specified for the methods defined in the remote interface [ simpleEJB.LabLocal ]. Method [ setDescription ] has no transaction attribute defined.
For [ D:-Linux-Java-LabJar.jar#LabJar.jar#LabBean ]
Error: There are no method permissions within this bean [ LabBean ]. Transaction attributes must be specified for the methods defined in the remote interface [ simpleEJB.LabLocal ]. Method [ getResult ] has no transaction attribute defined.
For [ D:-Linux-Java-LabJar.jar#LabJar.jar#LabBean ]
Error: There are no method permissions within this bean [ LabBean ]. Transaction attributes must be specified for the methods defined in the remote interface [ simpleEJB.LabLocal ]. Method [ getExperiment ] has no transaction attribute defined.
For [ D:-Linux-Java-LabJar.jar#LabJar.jar#LabBean ]
Error: There are no method permissions within this bean [ LabBean ]. Transaction attributes must be specified for the methods defined in the remote interface [ simpleEJB.LabLocal ]. Method [ setResult ] has no transaction attribute defined.
I�ve read the forum in search for an good answer and found some sugestions to look in the security and transaction tab in order to force the tool to generate the entries for the methods. It did not helped at all.
I tried to change the defaults in transaction tab from "required" to "mandatory". When I save, the tool presents the root screen of the jar file, but when I go check the values of the transaction atributes, they are again set to "required" .
In the descriptor viewer for the application descriptor it shows:
<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE sun-ejb-jar PUBLIC "-//Sun Microsystems, Inc.//DTD Sun ONE Application Server 8.0 EJB 2.1//EN" "http://www.sun.com/software/sunone/appserver/dtds/sun-ejb-jar_2_1-0.dtd"> <sun-ejb-jar> <enterprise-beans> <name>LabJar</name> <unique-id>366779567</unique-id> <ejb> <ejb-name>LabBean</ejb-name> <jndi-name>LabBean</jndi-name> </ejb> </enterprise-beans> </sun-ejb-jar>
I cant get to edit it when I try.
I am using the "Deployment Tool for Java 2 Plataform Enterprise Edition 1.4" from the J2EE SDK 1.4_2 running on Windows 2000 SP4.
Tks in advance,
Leonardo.
P.S.: Ok. Isnt it silly. I wrote all that, and then choose "supported" instead of mandatory, saved and verified that it saved the setting indeed. returned to required and runned the test. It worked.

How to catch exception in JSP????

how to catch exception in JSP?
I use JDeveloper 3.1
I use connection with database .
When I insert record in database
when have duplicate of primary key
how to catch this exception and
back to previous page?
I trying with folowing:
<jsp:useBean id="RowEditor" class="oracle.jbo.html.databeans.EditCurrentRecord" scope="request">
<% try {
RowEditor.setUseJS(true);
RowEditor.initialize(pageContext, "package2_Package2Module.Drzavi1View");
RowEditor.setSubmitText("Save");
RowEditor.setTargetUrl("Drzavi1View_SubmitInsertForm.jsp");
RowEditor.createNewRow();
RowEditor.setReleaseApplicationResources(true);
RowEditor.render();
catch(Exception e) {
%>
<script>
alert("primary key duplication");
history.back();
</script>
<% } %>
but i't not working
please help me

i catch exceptions as you do, i don't have any problem...
are you throwing the exception from your bean?
actually i don't catch an Exception, but an SQLException...
but it works... here is my code...
try
myclass.addElement(); // this is an insert into Oracle
catch( DataBaseFailException e ) /// an exception that i throws inside after i receive an SQLException
session.setAttribute("gMessage","e.getMessage()); // error code

How to catch up Exception message?

i have a question while using try{ ... }catch{ ... } clauses. for when update, delete, databse, there might be error occurred. all to often i do not deal with the message, only if to check log when serious problem i have to find it out; but i hope to learn how if i am able to display message of my own while erro occurrs. for instance, when falling into SQLException, originaly i might just utilize
}catch(SQLException e){
e.printStackTrace();
is it possible for me to catch up message inside the printStackTrace that may happen while errors appearing? (or only down to catch{} clause be the last deadline that i am able to use? because i hope i am able to capture error code like ora-1234 and tranlate it into messages that user, who doesn't know too much about pc, can understand easily while reporting bug; and not just saying "we have problem here!")
that is, if 'A' situation popping out, i hope to direct it to error page with special message shown. so does the same error page with different message specified while 'B' situation found out!
any suggestions would be appreciated~
thanks in advice,

printStackTrace isn't obligatory. It's basically what you do with an exception when you don't have anything more specific to do with it.
You can certainly catch a specific exception at any level, including inside another try {} block.
Even having caught an exception you can decide that you don't want to handle it at this point in the code, and throw it again.
You might do:
try {
     try {
       ... statment which migh cause a particular database exception
        } catch(SQLException e) {
        if(e.getMessage().startsWith("ORA-1232")) {
          .. do somthing usefull
         } else
        throw e;   // the particular SQL exception was unexpected so go on and crash
   catch(Exception e) {
     e.printStackTrace();   // unexpected program failure

Physical table name - abstract table name mapping in CMP Bean

Hello,
I am using a EJB 2.x bean deployed on a SJSAS 9 server. EJB has problem associating the EJB to the actual table
Details are as follows:
EJB name: AccountCMP
Actual tablename : account
Error
ejb store called
IM: postInvokeentity3.AccountBean145996470_ConcreteImpl@d6be89
EJB5071: Some remote or transactional roll back exception occurred
com.sun.jdo.api.persistence.support.JDODataStoreException: JDO76400: Got a JDBC SQLException while executing the SQL statement:
insert into "ACCOUNTCMP"("DESCRIPTION", "ACCOUNTNAME", "BALANCE", "ACCID") values ( ?, ?, ?, ?).
Please examine the SQLException for more information.
NestedException: java.sql.SQLException: ORA-00942: table or view does not exist
FailedObjectArray: [entity3.AccountBean145996470_JDOState@5332ca]
Please note that the insert statement has the ejb-name (I think so, as my CMP EJB is called ACCOUNTCMP) instead of the actual tablename (account).
I do have the account.dbschema file and sun-cmp-mappings.xml in the NB 5.5 project, but the mappings.xml file is not included in the jar by NB. Is that expected, or an problem.
sun-cmp-mappings.xml
<sun-cmp-mappings>
<sun-cmp-mapping>
    <schema>account</schema>
    <entity-mapping>
      <ejb-name>AccountCMP</ejb-name>
      <table-name>account</table-name>
      <cmp-field-mapping>
ejb-jar.xml
<enterprise-beans>
        <entity>
            <ejb-name>AccountCMP</ejb-name>
            <local-home>entity3.AccountLocalHome</local-home>
            <local>entity3.AccountLocal</local>
            <ejb-class>entity3.AccountBean</ejb-class>
            <persistence-type>Container</persistence-type>
            <prim-key-class>entity3.AccountPK</prim-key-class>
            <reentrant>false</reentrant>
            <cmp-version>2.x</cmp-version>
            <abstract-schema-name>account</abstract-schema-name> Thank you for your help.

Hello,
I found out the issue. sun-cmp-mappings.xml file is mandatory, and dont know why, netbeans excludes this file from the jar. I had to edit project.properties file to negate this exclusion.
Another problem was that my table did not have a primary key (and hence by schema file did not have it also). CMP bean code generator did not like this.
Once I fixed these two problems, my CMP started working fine.
Thank you all

How to catch exception when have max connection pool

hi,
i have define in oracle user that i could have max 10 sessions at the same time.
I have jdbc datasource & connection pool defined at glassfish server(JSF application).
now, if in application is too many queries to the database then i have error: nullpointer exception - becouse when i try to do:
con = Database.createConnection(); - it generates nullpointer exception becouse there isn't free connection pool
i try to catch exception like this:
public List getrep_dws_wnioski_wstrzymane_graph() {     int i = 0;     try {     con = Database.createConnection();     ps =    (Statement) con.createStatement();     rs = ps.executeQuery("select data, klasa, ile_dni_wstrzymana, ile_wnioskow from stg1230.dwsww_wstrzymane_dws8 order by data, klasa, ile_dni_wstrzymana, ile_wnioskow");     while(rs.next()){       rep_dws_wnioski_wstrzymane_graph.add(i,new get_rep_dws_wnioski_wstrzymane_graph(rs.getString(1),rs.getString(2),rs.getString(3),rs.getString(4)));       i++;     }     } catch (NamingException e) {         e.printStackTrace();     } catch (SQLException e) {         e.printStackTrace();     } catch (NullPointerException e) {         e.printStackTrace();         throw new NoConnectionException(); // catch null 1     } finally {     try {         con.close();     } catch (SQLException e) {         e.printStackTrace();     } catch (NullPointerException e) {         e.printStackTrace();         throw new NoConnectionException(); // catch null 2     }     } return rep_dws_wnioski_wstrzymane_graph; }
but at line:
con.close();
i have nullpointerexception
and
at line
throw new NoConnectionException(); // catch null 2
i have: caused by exception.NoConnectionException
what's wrong with my exception class? how to resolve it?
public class NoConnectionException extends RuntimeException{     public NoConnectionException(String msg, Throwable cause){       super(msg, cause);     }     public NoConnectionException(){       super();     } }
at web.xml i have defined:
<error-page>         <exception-type>exception.NoConnectionException</exception-type>         <location>/NoConnectionExceptionPage.jsp</location>     </error-page>

thanks,
i did it and i have error:
java.sql.SQLException: Error in allocating a connection. Cause: Connection could not be allocated because: ORA-02391: exceeded simultaneous SESSIONS_PER_USER limit
at com.sun.gjc.spi.base.DataSource.getConnection(DataSource.java:115)
at logic.Database.createConnection(Database.java:37): conn = ds.getConnection();
public class Database {
     public static Connection createConnection() throws NamingException,
                SQLException {
            Connection conn = null;
            try{
                Context ctx = new InitialContext();
          if (ctx == null) {
               throw new NamingException("No initial context");
          DataSource ds = (DataSource) ctx.lookup("jdbc/OracleReports");
          if (ds == null) {
               throw new NamingException("No data source");
          conn = ds.getConnection(); // here's exception when max connections to database
          if (conn == null) {
               throw new SQLException("No database connection");
            } catch (NamingException e) {
                e.printStackTrace();
                throw new NoConnectionException();
         } catch (SQLException e) {
             e.printStackTrace();
                throw new NoConnectionException();
            catch (NullPointerException e) {
             e.printStackTrace();
                throw new NoConnectionException(); // obsluga bledy na wypadek jesli braknie wolnych polaczen do bazy
        return conn;
}and at my ealier code i have error:
at logic.GetDataOracle.getrep_dws_wnioski_wstrzymane_graph(GetDataOracle.java:192)
at line: con = Database.createConnection();
in code:
public List getrep_dws_wnioski_wstrzymane_graph() {
    int i = 0;
    try {
    con = Database.createConnection();
    ps =    (Statement) con.createStatement();
    rs = ps.executeQuery("select data, klasa, ile_dni_wstrzymana, ile_wnioskow from stg1230.dwsww_wstrzymane_dws8 order by data, klasa, ile_dni_wstrzymana, ile_wnioskow");
    while(rs.next()){
      rep_dws_wnioski_wstrzymane_graph.add(i,new get_rep_dws_wnioski_wstrzymane_graph(rs.getString(1),rs.getString(2),rs.getString(3),rs.getString(4)));
      i++;
    } catch (NamingException e) {
        e.printStackTrace();
    } catch (SQLException e) {
        e.printStackTrace();
    } catch (NullPointerException e) {
        e.printStackTrace();
        throw new NoConnectionException();
    } finally {
    try {
        if(con != null)
        con.close();
    } catch (SQLException e) {
        e.printStackTrace();
    } catch (NullPointerException e) {
        e.printStackTrace();
        throw new NoConnectionException();
return rep_dws_wnioski_wstrzymane_graph;
}so what's wrong?
i have limit max sessions 10 at oracle so i set at my connection pool 5 connections as max. But when i get max 5 sesssins and try to execute next query then i can't catch exception..

How to catch SQLException in CMP bean

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