<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<html>
<body link="#355491" alink="#4262a1" vlink="#355491" style="background: #e2e2e2; margin: 0; padding: 20px;">
<div>
        <table cellpadding="0" bgcolor="#FFFFFF" border="0" cellspacing="0" style="border: 1px solid #dadada; margin-bottom: 30px; width: 100%; -moz-border-radius: 6px; -webkit-border-radius: 6px;">
                <tbody>
                        <tr>
                                <td>
                                        <table border="0" cellpadding="0" cellspacing="0" bgcolor="#FFFFFF" style="border: solid 2px #ccc; background: #dadada; width: 100%; -moz-border-radius: 6px; -webkit-border-radius: 6px;">
                                                <tbody>
                                                        <tr>
                                                                <td bgcolor="#000000" valign="middle" height="58px" style="border-bottom: 1px solid #ccc; padding: 20px; -moz-border-radius-topleft: 3px; -moz-border-radius-topright: 3px; -webkit-border-top-right-radius: 5px; -webkit-border-top-left-radius: 5px;">
                                                                        <h1 style="color: #333333; font: bold 22px Arial, Helvetica, sans-serif; margin: 0; display: block !important;">
                                                                        <!-- To have a header image/logo replace the name below with your img tag -->
                                                                        <!-- Email clients will render the images when the message is read so any image -->
                                                                        <!-- must be made available on a public server, so that all recipients can load the image. -->
                                                                        <a href="http://community.jboss.org/index.jspa" style="text-decoration: none; color: #E1E1E1">JBoss Community</a></h1>
                                                                </td>
                                                        </tr>
                                                        <tr>
                                                                <td bgcolor="#FFFFFF" style="font: normal 12px Arial, Helvetica, sans-serif; color:#333333; padding: 20px; -moz-border-radius-bottomleft: 4px; -moz-border-radius-bottomright: 4px; -webkit-border-bottom-right-radius: 5px; -webkit-border-bottom-left-radius: 5px;"><h3 style="margin: 10px 0 5px; font-size: 17px; font-weight: normal;">
Class loader issue in javassist
</h3>
<span style="margin-bottom: 10px;">
created by <a href="http://community.jboss.org/people/armita">Arash Bijanzadeh</a> in <i>Javassist</i> - <a href="http://community.jboss.org/message/619450#619450">View the full discussion</a>
</span>
<hr style="margin: 20px 0; border: none; background-color: #dadada; height: 1px;">
<div class="jive-rendered-content"><p>I am trying to get a hold on javassist for one of our companies projects. I wrote this simple class for testing </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><pre class="jive-pre"><code class="jive-code">
public class Main {
    public void test(){
        ClassPool cp = ClassPool.getDefault();
        CtClass entity = cp.makeClass("Entity");
        try {
            entity.addField(CtField.make(" public Integer id;",entity));
            entity.addField(CtField.make(" public String name;", entity));
            entity.addMethod(CtNewMethod.make("public void say() { System.out.println(12222);}",entity));
            Class EntityClass = entity.toClass();
            entity.writeFile("/tmp");
            Object e=  EntityClass.newInstance();
            Field name = EntityClass.getField("name");
            name.set("Ooldooz", e);
            System.out.println(name.get(e));
        } catch (CannotCompileException e) {
            e.printStackTrace();  //To change body of catch statement use File | Settings | File Templates.
        } catch (InstantiationException e) {
            e.printStackTrace();  //To change body of catch statement use File | Settings | File Templates.
        } catch (IllegalAccessException e) {
            e.printStackTrace();  //To change body of catch statement use File | Settings | File Templates.
        } catch (NoSuchFieldException e) {
            e.printStackTrace();  //To change body of catch statement use File | Settings | File Templates.
        } catch (IOException e) {
            e.printStackTrace();  //To change body of catch statement use File | Settings | File Templates.
        }
    }
    public static void main(String[] args){
        Main main = new Main();
        main.test();
    }
}</code></pre><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Trying to run, I get this error:</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><blockquote class="jive-quote"><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Exception in thread "main" java.lang.IllegalArgumentException: Can not set java.lang.String field Entity.name to java.lang.String</p><p>          at sun.reflect.UnsafeFieldAccessorImpl.throwSetIllegalArgumentException(UnsafeFieldAccessorImpl.java:146)</p><p>          at sun.reflect.UnsafeFieldAccessorImpl.throwSetIllegalArgumentException(UnsafeFieldAccessorImpl.java:150)</p><p>          at sun.reflect.UnsafeFieldAccessorImpl.ensureObj(UnsafeFieldAccessorImpl.java:37)</p><p>          at sun.reflect.UnsafeObjectFieldAccessorImpl.set(UnsafeObjectFieldAccessorImpl.java:57)</p><p>          at java.lang.reflect.Field.set(Field.java:657)</p><p>          at Main.test(Main.java:26)</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p></blockquote><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Can anybody help me out please?</p></div>
<div style="background-color: #f4f4f4; padding: 10px; margin-top: 20px;">
<p style="margin: 0;">Reply to this message by <a href="http://community.jboss.org/message/619450#619450">going to Community</a></p>
        <p style="margin: 0;">Start a new discussion in Javassist at <a href="http://community.jboss.org/choose-container!input.jspa?contentType=1&containerType=14&container=2062">Community</a></p>
</div></td>
</tr>
</tbody>
</table>
</td>
</tr>
</tbody>
</table>
</div>
</body>
</html>