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using flush in custom tags

 
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Hi ,

When I tried to use flush() from custom tag class.It gives exception.
Here's my code

public class Welcome extends BodyTagSupport
{

public int doStartTag()
{
return EVAL_BODY_BUFFERED;
}
public int doAfterBody()
{
try
{
BodyContent bc = getBodyContent();
String str = bc.getString();
JspWriter out = pageContext.getOut();
System.out.println("Printing string before manipulation"+str);
str ="hello"+str;
out.println(str);
System.out.println("Printing string after manipulation"+str);
out.flush();


}
catch (Exception e)
{
e.printStackTrace();
}

return EVAL_BODY_INCLUDE;
}
}


why?
 
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16
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Can you also post the stack trace ?
 
amar nath jha
Ranch Hand
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hi

here is stack trace....................................................

java.io.IOException: Illegal to flush within a custom tag
at javax.servlet.jsp.tagext.BodyContent.flush(BodyContent.java:119)
at day4.customtag.Welcome.doAfterBody(Welcome.java:30)
at org.apache.jsp.day4.jspfiles.hello_jsp._jspx_meth_welcome_user_0(hell
o_jsp.java:108)
at org.apache.jsp.day4.jspfiles.hello_jsp._jspService(hello_jsp.java:75)

at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:133)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:856)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper
.java:311)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:3
01)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:248)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:856)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Appl
icationFilterChain.java:284)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationF
ilterChain.java:204)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperV
alve.java:256)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValv
eContext.java:151)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.jav
a:563)
at org.apache.catalina.core.StandardContextValve.invokeInternal(Standard
ContextValve.java:245)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextV
alve.java:199)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValv
eContext.java:151)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(Authentica
torBase.java:509)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValv
eContext.java:149)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.jav
a:563)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.j
ava:195)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValv
eContext.java:151)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.j
ava:164)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValv
eContext.java:149)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.jav
a:563)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineVal
ve.java:156)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValv
eContext.java:151)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.jav
a:563)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:972)

at org.apache.coyote.tomcat5.CoyoteAdapter.service(CoyoteAdapter.java:20
9)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java
:781)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.proce
ssConnection(Http11Protocol.java:549)
at org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java
:589)
at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadP
ool.java:666)
at java.lang.Thread.run(Thread.java:595)
 
amar nath jha
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hi

here is stack trace....................................................

java.io.IOException: Illegal to flush within a custom tag
at javax.servlet.jsp.tagext.BodyContent.flush(BodyContent.java:119)
at day4.customtag.Welcome.doAfterBody(Welcome.java:30)
at org.apache.jsp.day4.jspfiles.hello_jsp._jspx_meth_welcome_user_0(hell
o_jsp.java:108)
at org.apache.jsp.day4.jspfiles.hello_jsp._jspService(hello_jsp.java:75)

at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:133)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:856)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper
.java:311)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:3
01)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:248)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:856)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Appl
icationFilterChain.java:284)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationF
ilterChain.java:204)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperV
alve.java:256)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValv
eContext.java:151)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.jav
a:563)
at org.apache.catalina.core.StandardContextValve.invokeInternal(Standard
ContextValve.java:245)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextV
alve.java:199)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValv
eContext.java:151)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(Authentica
torBase.java:509)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValv
eContext.java:149)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.jav
a:563)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.j
ava:195)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValv
eContext.java:151)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.j
ava:164)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValv
eContext.java:149)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.jav
a:563)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineVal
ve.java:156)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValv
eContext.java:151)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.jav
a:563)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:972)

at org.apache.coyote.tomcat5.CoyoteAdapter.service(CoyoteAdapter.java:20
9)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java
:781)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.proce
ssConnection(Http11Protocol.java:549)
at org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java
:589)
at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadP
ool.java:666)
at java.lang.Thread.run(Thread.java:595)
 
Ranch Hand
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Hey Amar Nath Jha just uncomment the System.out.println statements and give a shot.....

Cheers !!!
Sumit Malik
 
Sumit Malik
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I think this link would help you up...

Cheers !!!
Sumit Malik
 
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