No data is fetched from Java file to Velocity Macro file

StackOverflow https://stackoverflow.com/questions/23422298

  •  14-07-2023
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Question

I have the following code in java file in which a HashMap is storing some data and i want it to be displayed as a template in a vm file. package gt;

import java.io.StringWriter;
import java.util.*;
import org.apache.velocity.Template;
import org.apache.velocity.VelocityContext;
import org.apache.velocity.app.VelocityEngine;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Map;

public class Stu {
     VelocityEngine ve = new VelocityEngine();
      ve.init();

      @SuppressWarnings("rawtypes")
    ArrayList list = new ArrayList();

      Map map = new HashMap();
     map = new HashMap();
      map.put("rno", "2");
      map.put("name", "Komal");
      map.put("cla", "Bca");
      list.add(map);

      VelocityContext context = new VelocityContext();
      context.put("stuDetails", list);
      context.put("Name", new Stu());

      Template t = ve.getTemplate("VMFile/stu.vm");
      StringWriter writer = new StringWriter();
      t.merge(context, writer);

      System.out.println(writer);
      }
}

vm file looks like this

No of student is : $stuDetails.size()

Details of student

#foreach( $stuu in $stuDetails ) 
Roll No - $stuu.rno 
Name - $stuu.name 
Class - $stuu.cla >

#end

Why no data is fetched from HashMap into vm file? Below is my console output

May 02, 2014 12:29:42 PM org.apache.catalina.core.AprLifecycleListener init
INFO: The APR based Apache Tomcat Native library which allows optimal performance in production environments was not found on the java.library.path: C:\Program Files (x86)\Java\jre8\bin;C:\Windows\Sun\Java\bin;C:\Windows\system32;C:\Windows;C:\Program Files\Common Files\Microsoft Shared\Microsoft Online Services;C:\Program Files (x86)\Common Files\Microsoft Shared\Microsoft Online Services;C:\Windows\system32;C:\Windows;C:\Windows\System32\Wbem;C:\Windows\System32\WindowsPowerShell\v1.0\;C:\Program Files\Intel\DMIX;C:\Program Files\nodejs\;C:\Users\deepakgopal\AppData\Roaming\npm;.
May 02, 2014 12:29:42 PM org.apache.tomcat.util.digester.SetPropertiesRule begin
WARNING: [SetPropertiesRule]{Server/Service/Engine/Host/Context} Setting property 'source' to 'org.eclipse.jst.jee.server:dee' did not find a matching property.
May 02, 2014 12:29:42 PM org.apache.coyote.AbstractProtocolHandler init
INFO: Initializing ProtocolHandler ["http-bio-8080"]
May 02, 2014 12:29:42 PM org.apache.coyote.AbstractProtocolHandler init
INFO: Initializing ProtocolHandler ["ajp-bio-8009"]
May 02, 2014 12:29:42 PM org.apache.catalina.startup.Catalina load
INFO: Initialization processed in 355 ms
May 02, 2014 12:29:42 PM org.apache.catalina.core.StandardService startInternal
INFO: Starting service Catalina
May 02, 2014 12:29:42 PM org.apache.catalina.core.StandardEngine startInternal
INFO: Starting Servlet Engine: Apache Tomcat/7.0.12
May 02, 2014 12:29:43 PM org.apache.coyote.AbstractProtocolHandler start
INFO: Starting ProtocolHandler ["http-bio-8080"]
May 02, 2014 12:29:43 PM org.apache.coyote.AbstractProtocolHandler start
INFO: Starting ProtocolHandler ["ajp-bio-8009"]
May 02, 2014 12:29:43 PM org.apache.catalina.startup.Catalina start
INFO: Server startup in 1221 ms
Was it helpful?

Solution

You have no method in your code, that is what causes your syntax error. You calls are in the declaration section, move them into a method. Sth like

import java.io.StringWriter;
import java.util.*;
import org.apache.velocity.Template;
import org.apache.velocity.VelocityContext;
import org.apache.velocity.app.VelocityEngine;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Map;

public class Stu {

  public static void main(String[] argv) {
    VelocityEngine ve = new VelocityEngine();
    Properties p = new Properties();
    p.setProperty("resource.loader", "file");
    p.setProperty("file.resource.loader.class", "org.apache.velocity.runtime.resource.loader.FileResourceLoader");
    p.setProperty("file.resource.loader.path", "***INSERT TEMPLATEDIR***");
    p.setProperty("file.resource.loader.cache", "false");
    p.setProperty("file.resource.loader.modificationCheckInterval", "0");
    ve.init(p);
    @SuppressWarnings("rawtypes")
    ArrayList list = new ArrayList();

    Map map = new HashMap();
    map.put("rno", "2");
    map.put("name", "Komal");
    map.put("cla", "Bca");
    list.add(map);

    VelocityContext context = new VelocityContext();
    context.put("stuDetails", list);

    Template t = ve.getTemplate("stu.vm");
    StringWriter writer = new StringWriter();
    t.merge(context, writer);

    System.out.println(writer);
  }
}

if you want to use it as main method.

OTHER TIPS

I think the way of accessing the values of a map is with the [] notation:

No of student is : $stuDetails.size()

Details of student

#foreach( $stuu in $stuDetails ) 
Roll No - $stuu["rno"] 
Name - $stuu["name"]
Class - $stuu["cla"] >

#end
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