Mike.G wrote:
Hi, everyone,
I run the tomcat 6.0.18 on my ubuntu 8.04.2, the jdk version is 1.6.0_07
I configure the localhost 's ROOT to my home directory /home/ghw/myjava
the configuration file like this:
<?xml version='1.0' encoding='utf-8'?>
<Server port="8005" shutdown="SHUTDOWN">
<Listener className="org.apache.catalina.core.AprLifecycleListener"
SSLEngine="on" />
<Listener className="org.apache.catalina.core.JasperListener" />
<Listener
className="org.apache.catalina.mbeans.ServerLifecycleListener"
/>
<Listener
className="org.apache.catalina.mbeans.GlobalResourcesLifecycleListener"
/>
<GlobalNamingResources>
<Resource name="UserDatabase" auth="Container"
type="org.apache.catalina.UserDatabase"
description="User database that can be updated and saved"
factory="org.apache.catalina.users.MemoryUserDatabaseFactory"
pathname="conf/tomcat-users.xml" />
</GlobalNamingResources>
<Service name="Catalina">
<Connector port="8080" protocol="HTTP/1.1"
connectionTimeout="20000"
redirectPort="8443" />
<Connector port="8009" protocol="AJP/1.3" redirectPort="8443" />
<Engine name="Catalina" defaultHost="localhost">
<Realm className="org.apache.catalina.realm.UserDatabaseRealm"
resourceName="UserDatabase"/>
<Host name="localhost" appBase="webapps"
unpackWARs="true" autoDeploy="true"
xmlValidation="false" xmlNamespaceAware="false">
</Host>
</Engine>
</Service>
</Server>
and I created the directory understand
CATALINE_HOME/conf/Catalina/localhost
and create a ROOT.xml in there
like this:
<?xml version="1.0" encoding="utf-8"?>
<Context path="" docBase="/home/ghw/myjava" debug="9" reloadable="9" >
</Context>
when write a test index.jsp in /home/ghw/myjava, it works.
and when I try to write a Tag class in there, it will be report Error:
*type* Exception report
*message*
*description* *The server encountered an internal error () that prevented
it
from fulfilling this request.*
*exception*
org.apache.jasper.JasperException: Unable to compile class for JSP:
An error occurred at line: 10 in the jsp file: /test.jsp
JavaScriptExampleTag cannot be resolved to a type
7: </head>
8: <body>
9: <p>This is a simple test page </p>
10: <my:message>
11: This is a simple java alert message
12: </my:message>
13:
An error occurred at line: 10 in the jsp file: /test.jsp
JavaScriptExampleTag cannot be resolved to a type
7: </head>
8: <body>
9: <p>This is a simple test page </p>
10: <my:message>
11: This is a simple java alert message
12: </my:message>
13:
An error occurred at line: 10 in the jsp file: /test.jsp
JavaScriptExampleTag cannot be resolved to a type
7: </head>
8: <body>
9: <p>This is a simple test page </p>
10: <my:message>
11: This is a simple java alert message
12: </my:message>
13:
Stacktrace:
org.apache.jasper.compiler.DefaultErrorHandler.javacError(DefaultErrorHandler.java:92)
org.apache.jasper.compiler.ErrorDispatcher.javacError(ErrorDispatcher.java:330)
org.apache.jasper.compiler.JDTCompiler.generateClass(JDTCompiler.java:423)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:317)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:295)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:282)
org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:586)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:317)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:342)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:267)
here is my web.xml
<taglib>
<taglib-uri>
/WEB-INF/tld/JavaScriptExampleTag.tld
</taglib-uri>
<taglib-location>
/WEB-INF/tld/JavaScriptExampleTag.tld
</taglib-location>
</taglib>
and the tld file is like this:
<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE taglib
PUBLIC "-//Sun Microsystems, Inc.//DTD JSP Tag Library 1.2//EN"
"http://java.sun.com/j2ee/dtd/web-jsptaglibrary_1_2.dtd";>
<taglib>
<tlib-version>1.0</tlib-version>
<jsp-version>1.2</jsp-version>
<short-name>JavaScriptExampleTag</short-name>
<uri>/WEB-INF/tld/JavaScriptExampleTag.tld</uri>
<description>
A simple tab library for the examples
</description>
<tag>
<name>message</name>
<tag-class>JavaScriptExampleTag</tag-class>
<info>Display Alert Box</info>
</tag>
</taglib>
and the Tag class like this:
import java.io.IOException;
import javax.servlet.jsp.*;
import javax.servlet.jsp.tagext.*;
public class JavaScriptExampleTag extends BodyTagSupport {
public int doEndTag() throws JspTagException {
String ls_alert = "";
try {
BodyContent lbc_bodycurrent = getBodyContent();
if ( lbc_bodycurrent != null ) {
String ls_message = lbc_bodycurrent.getString();
JavaScriptExample JS = new JavaScriptExample();
ls_alert = JS.alert(ls_message.trim());
}
pageContext.getOut().write(ls_alert);
} catch ( IOException e ) {
throw new JspTagException("Error " + e.toString());
}
return EVAL_PAGE;
}
}
Put your tag class in a package, and make sure the tag class is in the
correct folder like so:
myapp/index.jsp
myapp/WEB-INF/classes/com/myapp/YourTag.class
myapp/WEB-INF/tld/YourTag.tld
Adjust the tag class definition in the the TLD accordingly.
p
and the Bean class is like this:
import java.io.Serializable;
public class JavaScriptExample implements Serializable {
public JavaScriptExample() {
}
public String alert(Object aobj_data) {
return( start_script + " alert(\" " +
aobj_data.toString() + "\");" +
end_script );
}
//private area
private String start_script = "<script language=\"javascript\">";
private String end_script = "</script>";
}
anyone can help me on this?
thanks very much
Mike
javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
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