Hello,
I am trying to develop my own tags. I do not know if this is the right place
to ask but I hope so. The Tag I am developing should read string from a db
and put it in a <select> box on the page. I just can not get it to work and
I am running out of ideas. Please tell me what I am doing wrong. I really
need this code to run. Here comes my code:
package tags;
import javax.servlet.jsp.*;
import javax.servlet.jsp.tagext.*;
import dataconn.*;
/**
* @author Loesekann
*
* To change the template for this generated type comment go to
* Window>Preferences>Java>Code Generation>Code and Comments
*/
public class DBCombobox extends TagSupport {
private String colum = null;
private String table = null;
private String name = null;
private String css_class = null;
private String def_str = null;
public DBCombobox() {
super();
}
/**
* doStartTag is called by the JSP container when the tag is encountered
*/
public int doStartTag() {
try {
System.out.println("Tag Start\n");
JspWriter page = pageContext.getOut();
page.println("<select size=\"1\" name=" +name+ " class=" +css_class+ ">");
page.println("<option value=''></option>");
tmsDataBean tmsBean = (tmsDataBean)pageContext.findAttribute("tmsBean");
tmsBean.setQuery("select distinct " +colum+ " from " +table);
if(tmsBean.getRecords()){
String Value = null;
while(tmsBean.getNextRecord()){
Value=tmsBean.getColumn(colum);
page.print("<option value='" +Value+"' ");
if(def_str.equals(Value))
page.print(" selected ");
page.print(">" +Value+ "</option>");
}
tmsBean.cleanup();
}
}catch(Exception e) {
System.out.println("doStartTag Exception.\n");
e.printStackTrace();
}
//Must return SKIP_BODY because we are not supporting a body for this
// tag.
return SKIP_BODY;
}
/**
* doEndTag is called by the JSP container when the tag is closed
*/
public int doEndTag(){
try {
JspWriter out = pageContext.getOut();
out.println("</select>");
} catch (Exception e){
System.out.println("doEndTag Exception");
e.printStackTrace();
}
return EVAL_PAGE;
}
/**
* @return
*/
public String getColum() {
return colum;
}
/**
* @return
*/
public String getCss_class() {
return css_class;
}
/**
* @return
*/
public String getDef_str() {
return def_str;
}
/**
* @return
*/
public String getName() {
return name;
}
/**
* @return
*/
public String getTable() {
return table;
}
/**
* @param string
*/
public void setColum(String string) {
colum = string;
}
/**
* @param string
*/
public void setCss_class(String string) {
css_class = string;
}
/**
* @param string
*/
public void setDef_str(String string) {
def_str = string;
}
/**
* @param string
*/
public void setName(String string) {
name = string;
}
/**
* @param string
*/
public void setTable(String string) {
table = string;
}
}
The TLD file looks like this:
<?xml version="1.0" encoding="ISO-8859-1" ?>
<!DOCTYPE taglib PUBLIC "-//Sun Microsystems, Inc.//DTD JSP Tag Library
1.1//EN"
"http://java.sun.com/j2ee/dtds/web-jsptaglibrary_1_1.dtd";>
<taglib>
<tlibversion>1.0</tlibversion>
<jspversion>1.1</jspversion>
<shortname>tmstaglib</shortname>
<info>Trinity Tag Libary for eTMS</info>
<!--A Simple tag -->
<tag>
<name>dbcombobox</name>
<tagclass>tags.DBCombobox</tagclass>
<!--Body content can have a value of
empty: no body
JSP: body that is evaluated by container, then possibly processed by the tag
tagdependent: body is only processed by tag; JSP in body is not evaluated.
-->
<bodycontent>empty</bodycontent>
<info>This this combobox tag gets its lines from a db query.</info>
<!-- Optional attributes -->
<attribute>
<name>colum</name>
<required>true</required>
<rtexprvalue>true</rtexprvalue>
</attribute>
<attribute>
<name>table</name>
<required>true</required>
<rtexprvalue>true</rtexprvalue>
</attribute>
<attribute>
<name>name</name>
<required>true</required>
<rtexprvalue>false</rtexprvalue>
</attribute>
<attribute>
<name>css_class</name>
<required>true</required>
<rtexprvalue>true</rtexprvalue>
</attribute>
<attribute>
<name>def_str</name>
<required>true</required>
<rtexprvalue>true</rtexprvalue>
</attribute>
</tag>
</taglib>
My web.xml looks like this:
<?xml version="1.0" encoding="ISO-8859-1"?>
<!DOCTYPE web-app PUBLIC
"-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
"http://java.sun.com/dtd/web-app_2_3.dtd";
>
<web-app>
<context-param>
<param-name>ENGLISH</param-name>
<param-value>TRINITY - eTMS - Financial-Management WORLDWIDE
</param-value>
</context-param>
<context-param>
<param-name>GERMAN</param-name>
<param-value>TRINITY - eTMS - Financial-Management WORLDWIDE
</param-value>
</context-param>
<context-param>
<param-name>FRENCH</param-name>
<param-value>TRINITY - eTMS - Financial-Management WORLDWIDE
</param-value>
</context-param>
<context-param>
<param-name>SMALL_LOGO</param-name>
<param-value>images/logo_small.gif</param-value>
</context-param>
<context-param>
<param-name>SMALL_LOGO_WIDTH</param-name>
<param-value>30</param-value>
</context-param>
<context-param>
<param-name>SMALL_LOGO_HEIGHT</param-name>
<param-value>27</param-value>
</context-param>
<taglib>
<taglib-uri>/tags/tmstaglib</taglib-uri>
<taglib-location>/WEB-INF/tmstaglib.tld</taglib-location>
</taglib>
</web-app>
and in the jsp I inserted this:
<%@ taglib uri="/tags/tmstaglib" prefix="tmstl" %>
<td>
<tmstl:dbcombobox colum="siso" table="TMS_FPVIKLP" name="chf"
css_class="selectboxSmall" def_str="<%=chf%>" />
</td>
The Error Message of Tomcat 4.1.27 is:
java.lang.NoClassDefFoundError: javax/servlet/jsp/JspContext
at java.lang.Class.getDeclaredMethods0(Native Method)
at java.lang.Class.privateGetDeclaredMethods(Class.java:1647)
at java.lang.Class.getDeclaredMethods(Class.java:1131)
at java.beans.Introspector$1.run(Introspector.java:1126)
at java.security.AccessController.doPrivileged(Native Method)
at java.beans.Introspector.getPublicDeclaredMethods(Introspector.java:1124)
at java.beans.Introspector.getTargetMethodInfo(Introspector.java:989)
at java.beans.Introspector.getBeanInfo(Introspector.java:370)
at java.beans.Introspector.getBeanInfo(Introspector.java:144)
at
org.apache.jasper.compiler.Generator$TagHandlerInfo.(Generator.java:1946)
at
org.apache.jasper.compiler.Generator$GenerateVisitor.visit(Generator.java:10
93)
at org.apache.jasper.compiler.Node$CustomTag.accept(Node.java:707)
at org.apache.jasper.compiler.Node$Nodes.visit(Node.java:1028)
at org.apache.jasper.compiler.Node$Visitor.visitBody(Node.java:1070)
at org.apache.jasper.compiler.Node$Visitor.visit(Node.java:1076)
at org.apache.jasper.compiler.Node$Root.accept(Node.java:232)
at org.apache.jasper.compiler.Node$Nodes.visit(Node.java:1028)
at org.apache.jasper.compiler.Generator.generate(Generator.java:1917)
at org.apache.jasper.compiler.Compiler.generateJava(Compiler.java:242)
at org.apache.jasper.compiler.Compiler.compile(Compiler.java:369)
at
org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:4
73)
at
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:1
90)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:295)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:241)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Application
FilterChain.java:247)
at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterCh
ain.java:193)
at
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.ja
va:256)
at
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invok
eNext(StandardPipeline.java:643)
at
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
at
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.ja
va:191)
at
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invok
eNext(StandardPipeline.java:643)
at
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
at
org.apache.catalina.core.StandardContext.invoke(StandardContext.java:2416)
at
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:180
)
at
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invok
eNext(StandardPipeline.java:643)
at
org.apache.catalina.valves.ErrorDispatcherValve.invoke(ErrorDispatcherValve.
java:171)
at
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invok
eNext(StandardPipeline.java:641)
at
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:172
)
at
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invok
eNext(StandardPipeline.java:641)
at
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
at
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java
:174)
at
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invok
eNext(StandardPipeline.java:643)
at
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
at org.apache.coyote.tomcat4.CoyoteAdapter.service(CoyoteAdapter.java:223)
at
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:601)
at
org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConne
ction(Http11Protocol.java:392)
at
org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:565)
at
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.jav
a:619)
at java.lang.Thread.run(Thread.java:534)
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