java.util.ConCurrentModificationException

I tried to execute following code

ListIterator iterator = i.listIterator();
while(iterator.hasNext()) {
      System.out.println(iterator.next());
      Object obj=((Integer)iterator.next()).intValue();
      if(obj.equals(i.get(1))) {
           i.add(10);
      }
}

ant it throws following exception

Exception in thread "main" java.util.ConcurrentModificationException
at java.util.AbstractList$Itr.checkForComodification(AbstractList.java:372)
at java.util.AbstractList$Itr.next(AbstractList.java:343)
August 3, 2009 | Filed Under Exception | 1 Comment 

More than one value of type [net.sf.jasperreports.engine.JRDataSource] found

I getting this exception while using a subreport in my jasper report and trying to pass a datasource for my subreport. Datasource for report is ‘datasource’ and datasource for subreport is ‘pardatasource’.

org.springframework.web.util.NestedServletException: Request processing failed; nested exception is java.lang.IllegalArgumentException: More than one value of type [net.sf.jasperreports.engine.JRDataSource] found
org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:488)
org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:431)
javax.servlet.http.HttpServlet.service(HttpServlet.java:690)
javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
org.acegisecurity.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:265)
org.acegisecurity.intercept.web.FilterSecurityInterceptor.invoke(FilterSecurityInterceptor.java:107)
org.acegisecurity.intercept.web.FilterSecurityInterceptor.doFilter(FilterSecurityInterceptor.java:72)
org.acegisecurity.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:275)
org.acegisecurity.ui.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:110)
org.acegisecurity.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:275)
com.ccclogic.core.filter.SessionTimeoutFilter.doFilter(SessionTimeoutFilter.java:127)
July 28, 2009 | Filed Under Exception | 1 Comment 

javax.mail.MessagingException: 530 5.7.0 Must issue a STARTTLS

I am getting exception while sending mail using JavaMail APIs. Mail properties are as 

	mail.transport.protocol = smtp
	mail.smtp.host = mailHost
	mail.smtp.port = 25
	mail.smtp.auth = true

The exception I am getting while sending email

Exception in thread "main" javax.mail.SendFailedException: Sending failed;
        nested exception is:
	javax.mail.MessagingException: 530 5.7.0 Must issue a STARTTLS command first m1sm949464nzf
 	at javax.mail.Transport.send0(Transport.java:219)
	at javax.mail.Transport.send(Transport.java:81)
	at example.SendMailUsingAuthentication.postMail(SendMailUsingAuthentication.java:77)
	at example.SendMailUsingAuthentication.main(SendMailUsingAuthentication.java:35)
May 20, 2009 | Filed Under Exception, Java | 2 Comments 

java.sql.SQLException: Closed Connection

Caused by: java.sql.SQLException: Closed Connection: next at com.ibatis.sqlmap.engine.mapping.statement.GeneralStatement.executeQueryWithCallback(GeneralStatement.java:185) at com.ibatis.sqlmap.engine.mapping.statement.GeneralStatement.executeQueryForList(GeneralStatement.java:123)
at com.ibatis.sqlmap.engine.impl.SqlMapExecutorDelegate.queryForList(SqlMapExecutorDelegate.java:610)
at com.ibatis.sqlmap.engine.impl.SqlMapExecutorDelegate.queryForList(SqlMapExecutorDelegate.java:584)
at com.ibatis.sqlmap.engine.impl.SqlMapSessionImpl.queryForList(SqlMapSessionImpl.java:101)
at com.ibatis.sqlmap.engine.impl.SqlMapClientImpl.queryForList(SqlMapClientImpl.java:78)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:650)
March 17, 2009 | Filed Under Exception, J2ee | 1 Comment 

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