Loading .class files for reflection

I'm trying to write a program that lets the user select thier .class files to gather
information about those classes with reflection.
I can't figure out how to get ClassLoader to load .class files outside the program
directory.

I've tried both these options, and spent some time on it too,
but failed. If can't find a class that can load clases form a URL
how can I write my own ClassLoader that does it.
The ClassLoaders all seem to assume that they already know where
to look for the class files. Perhaps if I could tell them where to look,
but I don't see how.

Similar Messages

Finding loaded Class file from particular Jar

Hi,
I have multiple jars containing same class file.
How can I find out that the loaded Class file belongs to particular jar?
Thanks
madan

In most cases it's possible with ProtectionDomain and CodeSource:ProtectionDomain pd = YourClass.class.getProtectionDomain();
CodeSource cs = pd.getCodeSource();
if (cs != null) {
System.out.println("It came from " + cd.getLocation());
} else {
System.out.println("Location unknown.");
}For further information see
[url http://java.sun.com/j2se/1.4.2/docs/api/java/lang/Class.html#getProtectionDomain()]http://java.sun.com/j2se/1.4.2/docs/api/java/lang/Class.html#getProtectionDomain()
http://java.sun.com/j2se/1.4.2/docs/api/java/security/ProtectionDomain.html
http://java.sun.com/j2se/1.4.2/docs/api/java/security/CodeSource.html

For WebLogic 5.1, where should I put my class files for my JavaBeans?

With JBuilder4, I have built an application with JSP and a few Java Beans (Those JavaBeans are instantiated in those JSP files). There are no EJBs. The package name is called 'onlinetrade'. I have tested the application on JBuilder's web server, it works pretty well.
Now I am moving this application to WegLogic 5.1. I have encountered a problem with WebLogic 5.1
and do not know where I should place my JavaBean class files --
Originally, the JSP files for my application are in package path-- ..onlinetrade\jsp
and the class files for my beans are in the package path -- ..onlinetrade\jsp\bean\*.class
Now, with WebLogic 5.1,
1) I have put my JSP files in
C:\weblogic\myserver\public_html\onlinetrade\jsp
2) I have created subdirectory and put my bean class files in
C:\weblogic\myserver\classfiles\onlinetrade\jsp\bean
When I started weblogic and the first page - login.jsp page can be up and accessed. But when I login and forward to another JSP page called 'controller.jsp', where a bean is instantiated, I got the following error
Compilation of 'C:\weblogic\myserver\classfiles\jsp_servlet\_onlinetrade\_jsp\__controller.java' failed:
C:\weblogic\myserver\classfiles\jsp_servlet\_onlinetrade\_jsp\__controller.java:210: cannot access jsp_servlet._onlinetrade._jsp.registerBean
probably occurred due to an error in /onlinetrade/jsp/controller.jsp line 53:
registerBean registerBeanInstance = new registerBean();
I know the javac is working, and a java file is created upon the JSP page, but the problem is -- the bean class files cannot be found!!!
Where should I create the package path and put my bean class file so that my JSP pages can pick them up?
Any help is greatly appreciated!
Thanks.
--Tim

I have mine in WEB-INF/classes

How to get the .class file for the extended Controller .java file

Hi,
I did the below steps.
1. Created New OAWorkspace
2. Created New project
3. Imported the page .xml file
4. Added new .java file by extending the controller class
5. Added code in the .java file.
6. Ran the .xml file
As I copied all the folders from Unix box, the page was opened.
But My question was where can I see the .class file the extended controller. It's a .java file. How to compile and get the .class file for this .java file. If I get this .class file, I can go to the page and click the personlize page. and change the Controller name to the new path by ftp ing the new class to the cust.oracle.apps.pos.changeorder.webiui.
Please let me know how to create the .class file.
Thanks,
HP

All are Java files are stored in JDEV_INSTALL_DIR:\jdevhome\jdev\myprojects\
In your case the path java would be
JDEV_INSTALL_DIR:\jdevhome\jdev\ myprojects \cust\oracle\apps\pos\changeorder\webui\
AND
Once you compile the java file in Jdeveloper, Class files get generated @ below path
In your case the path of class would be
JDEV_INSTALL_DIR:\jdevhome\jdev\ myclasses \cust\oracle\apps\pos\changeorder\webui\
Duplicate Thread-
Thanks
--Anil
http://oracleanil.blogspot.com/

Cannot find the class file for com.sap.portal.services.api.connectorgateway

Hi,
I was trying the "How to BI JAVA SDK in a Portal iView and get the following error.
The project was not built since its classpath is incomplete. Cannot find the class file for com.sap.portal.services.api.connectorgateway.IConnectorGatewayService. Fix the classpath and try rebuilding this project.
I have the following in my portalapp.xml file
<property name="SharingReference" value="com.sap.portal.ivs.connectorservice"/>
and i have also added the jar file "com.sap.portal.ivs.connectorservice_api" in the set of lib's
Has some faced a similar issue? or can someone suggest how I could possibly resolve this.
Thanks,
Smitha

Hi Smitha:
My webdynpro dc was build failed for "This compilation unit indirectly references the missing type com.sap.engine.services.webservices.espbase.client.dynamic.content.GenericObject (typically some required class file is referencing a type outside the classpath)".
How should i do? Thank you!

Failed to load configuration file for the workflow

There are two of us who have full control on our Sharepoint 2013 site. I'm able to create workflows and publish them fine. The other user is able to create workflows, but he gets an error when trying to run them. I tried opening his workflow and got
the error "Failed to load configuration file for the workflow."
Any ideas?

Hi Carltonw1,
Based on your description, I recommend to verify the things below:
Clear the SharePoint Designer cache and then open the workflow.
Ask the user to open the workflow in SharePoint Designer and check if the workflow contains error.
Ask the user to create the same workflow and associated with another list to see how it works.
Check the ULS log for more detailed error message.
To reproduce this issue, could you please provide the detailed steps in the workflow for further research?
Thanks,
Victoria
Forum Support
Please remember to mark the replies as answers if they help and unmark them if they provide no help. If you have feedback for TechNet Subscriber Support, contact
[email protected]
Victoria Xia
TechNet Community Support

Error Msg - "You must add the Class files for this enterprise bean"

Hi,
I am creating creating new enterprise bean using j2sdkee1.2. I am able to create .ear file in desired folder, but can not create .jar. Please help. Getting above error message.
remote, home interface files and file having business logic (EJB) is compiled and kept at desired location.
j2ee server started, Deploytool is started.
Then I can successfully create new application (.ear file)
Then I go for creating new enterprise bean. I get same application name in Drop down list named "Enterprise Bean will go in".
Then I can add home, remote and ejb class file to create jar ("Add" under "Contents" ).
When I say ok after adding these 3 files, I am getting error - "You must add the Class files for this enterprise bean".
In the deploytool console, getting error - "java.io.FileNotFoundException: C:\2sdkee1.2\mahesh\ConverterEJB.class (The system cannot find the path specified) "
Can you please help me where to configure the path?
Can u please help?
Please send your answer to - [email protected]
Cheers!

the path really begins with '2', without a 'j', ie not c:\j2sdkee1.2\...?
"java.io.FileNotFoundException:
C:\2sdkee1.2\mahesh\ConverterEJB.class (The system
cannot find the path specified) "

What is limit to load csv file for Apex Utility?

What is limit to load csv file for Apex Utility?
How many records can I load through apex load utility?
I am loading csv files.
Thank you.

Hi,
You download the report that is displayed in APEX which is limited to 65k. There may be some way of creating a custom file based off the table rather than using APEX's built in export to csv option but I don't know of any being released. Denes produced an export to .xls option but I don't know how many rows that caters too: http://htmldb.oracle.com/pls/otn/f?p=31517:108:1512181285516724::NO:: -- I assume 65k too though.
Mike

Missing class file for extended controller

Any response/advice is greatly appreciated.
I've searched the forums, and I saw some had this error, but the post wasn't resolved. We are on 12.1.3. I've done this plenty of times when we were on 11.5.10 with great success. I've personalize a page to look at my extendedController, bounced apache:
adapcctl.sh stop
adoacorectl.sh stop
adoacorectl.sh start
adapcctl.sh start
Web page brings up:
oracle.apps.fnd.framework.OAException: oracle.jbo.JboException: JBO-29000: Unexpected exception caught: oracle.classloader.util.AnnotatedNoClassDefFoundError, msg= Missing class: emsc.oracle.apps.emscper.dor.webui.ExtDocsOfRecordUpdateCO (wrong name: ExtDocsOfRecordUpdateCO) Dependent class: emsc.oracle.apps.emscper.dor.webui.ExtDocsOfRecordUpdateCO Loader: oacore.root:0.0.0 Code-Source: /demsci/applmgr/common/java/classes/ Configuration: <library> in /demsci/applmgr/common/webapps/oacore/
Verified spelling, ensure class file is where it is suppose to be:
$ echo $JAVA_TOP
/demsci/applmgr/common/java/classes
$ echo `pwd`
/demsci/applmgr/common/java/classes/emsc/oracle/apps/emscper/dor/webui
Created new /dor/webui directory as user applmgr.
$ ls -ltr $JAVA_TOP/emsc/oracle/apps/emscper/dor/webui
total 9
-rw-r--r-- 1 apdemsci aademsci 3243 Nov 28 18:26 ExtDocsOfRecordUpdateCO.java
-rwxrwxrwx 1 apdemsci aademsci 3710 Nov 28 18:26 ExtDocsOfRecordUpdateCO.class
ClassPath has the $JAVA_TOP listed:
/demsci/applmgr/common/java/classes
Thanks

I moved the extended class to the standard directory: $JAVA_TOP/oracle/apps/per/dor/webui
Recompiled it there
From Functional Administrator, changed the path of the extended controller to the standard path:
oracle.apps.per.dor.webui.ExtDocsOfRecordUpdateCO
Bounced apache/cleared cached.
Received the same error, very strange....
Missing class: oracle.apps.per.dor.webui.ExtDocsOfRecordUpdateCO (wrong name: ExtDocsOfRecordUpdateCO) Dependent class: oracle.apps.per.dor.webui.ExtDocsOfRecordUpdateCO Loader: oacore.root:0.0.0 Code-Source: /demsci/applmgr/common/java/classes/ Configuration: <library> in /demsci/applmgr/common/webapps/oacore/
Verified the class file is there and it is where it is suppose to be:
$ pwd
/demsci/applmgr/common/java/classes/oracle/apps/per/dor/webui
you have mail in /var/spool/mail/apdemsci
$ ls -ltr ExtDocsOfRecordUpdateCO.class
-rw-r--r-- 1 apdemsci aademsci 3710 Nov 29 15:29 ExtDocsOfRecordUpdateCO.class
Makes no sense...
For your other point, I don't want rename the subdirectory since we have other extensions dependent on the path name.
Thanks

Loading class file stored in BLOB field

- I am able to store and retrieve Java files and XML files in and from a BLOB field, but when I store a class file and try and load it using Class Loader, it us unable to load the class. The size of the class file increases by 1 byte when I retrieve it from the database. Is this some security feature by the JVM? Is it not possible to store, retrieve and load a class file from a database table?
Thanks
Harini

Hi,
First, I would suggest you use fiddler (http://www.telerik.com/fiddler) to compare these two different client requests, second, please try to use Azure Storage Explorer (http://azurestorageexplorer.codeplex.com/) to do
this instead of the Azure Web Storage Explorer.
Best Regards,
Jambor
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Tomcat6 does not load class files from WEB-INF/lib/myjarfile.jar WHY???

I have placed my jar file in c:\tomcat6\webapps\my-application\WEB-INF\lib\myjarfile.jar
But, after restarting tomcat6, when i try to import the class file contained in the myjarfile.jar in a servlet, it says
ProcessFileUpload.java:4: package test.test1 does not exist
import test.test1.*;
^It clearly tomcat's class loading problem.
As i unzipped my jar and placed the packagefolder structure to
c:\tomcat6\webapps\my-application\WEB-INF\classes\testand it works perfectly.
Anyone knows its workaround? please suggest if any configuration changes is required in tomcat or so.
Thanks.
---Sujoy

Thank you gimbal2 . There was error in creating the jar file myjarfile.jar.
But, now I have created it again and placed it in place
c:\tomcat6\webapps\my-application\WEB-INF\lib\myjarfile.jarand tried to use one on the Class file included within the jar to compile my servlet. But, still I am getting error at servlet compilation time. I want to place executable jar files in
c:\tomcat6\webapps\my-application\WEB-INF\lib\myjarfile.jar and compile my servlet and execute the servlet.
I DO NOT WANT TO unzip the jar, placing all unzipped files to
c:\tomcat6\webapps\my-application\WEB-INF\classes\ folder and comiple my servlet and execute the servlet. But, I am failing to user WEB-INF\lib\ folder facility....please help me why i am not getting class files from WEB-INF\lib\ folder.
If you please see the small code bit and tell me any possible error that would be very helpful.
Step 1: my library java file MyClass.java
package test.test1;
public class MyClass {
     String myName = "Default return string value";
     public void setMyName(String varName) {
          this.myName = varName;
     public String getMyName() {
          return this.myName;
}Step2 : Creating jar file of my library class files
C:\jdk1.6\bin>jar cvf myjarfile.jar test
added manifest
adding: test/(in = 0) (out= 0)(stored 0%)
adding: test/test1/(in = 0) (out= 0)(stored 0%)
adding: test/test1/MyClass.class(in = 452) (out= 296)(deflated 34%)
adding: test/test1/MyClass.java(in = 230) (out= 140)(deflated 39%)
C:\jdk1.6\bin>Step3 : Double checking the created jar file content by listing its content
C:\jdk1.6\bin>jar tf myjarfile.jar
META-INF/
META-INF/MANIFEST.MF
test/
test/test1/
test/test1/MyClass.class
test/test1/MyClass.java
C:\jdk1.6\bin>Step4 : Placed myjarfile.jar to
c:\tomcat6\webapps\my-application\WEB-INF\lib\Step5 : Restarted standalone Tomcat6 in my Windows XP SP2.
Step6 : Created a simple servlet LibFolderTest.java within my-application\WEB-INF\classes\ folder with code
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
import test.test1.*;
public class LibFolderTest extends HttpServlet {
     public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
          response.setContentType("text/html");
          PrintWriter out = response.getWriter();
          MyClass mc = new MyClass();
          out.println(mc.getMyName());
}Step7 : Tried to compile my servlet LibFolderTest.java and got the following error
LibFolderTest.java:4: package test.test1 does not exist
import test.test1.*;
^
LibFolderTest.java:11: cannot find symbol
symbol : class MyClass
location: class LibFolderTest
                MyClass mc = new MyClass();
                ^
LibFolderTest.java:11: cannot find symbol
symbol : class MyClass
location: class LibFolderTest
                MyClass mc = new MyClass();
                                 ^
3 errorsThe above servlet compilation error on Step7 is telling me that myjarfile.jar is not loaded by Tomcat6 or not available for use when compiling servlet. I want to use myjarfile.jar from within WEB-INF\lib\ folder but I can not. please help.
---Sujoy

Plz help load class files

hai forum,
Plz help me out regarding this trouble.
I have extracted class files of a jar file into a local directory D:\myClass.
Now i need to access these class files.I loaded the path D:\myClass using URL ClassLoader.
                              File file = new File("D:myClass");
                      URL url = file.toURL();
                      URL[] urls = new URL[]{url};
                      ClassLoader cl = new URLClassLoader(urls);
                      Class c = cl.loadClass(classname);The rest of the code is for listing the methods of the class file.But the class file is not getting loaded and thus the methods are not listed.
Has it got anything to do with the way i have extracted and stored the class files?
Plz help me identify my mistake.
Thank you.

Hi, I will borrow this thread to discuss my problem with loading a class file.
How do you use the class when you have loaded it?
I'm using this code:
File file = new File("C:\\Foo\\Foo.class");
URL url = file.toURL();
URL[] urls = new URL[]url;
ClassLoader cl = new URLClassLoader(urls);
Class c = cl.loadClass(cl.getClass().getName());
Object o = c.newInstance(); <-- This can't be done, my applet just stops and starts to wait or something. I don't get any exception or anything.
The class Foo.class has a constructor that's prints some text and a function that can print some other text. Is it possible to call that function in some way?

How to reload class file for java objects in CF MX7

I'm trying to create a simple java object for use in a CFML
page. According to the topic "About ColdFusion and Java objects" in
the CF developer's guide, I can compile my java module and put the
.class file in the CFusionMX7/wwwroot/WEB-INF/classes directory and
it'll be dynamically reloaded any time CF sees a new .class file
there. But the dynamic reload isn't happening; I have to restart
the CF server to get it to pick up a new version.
I don't believe this directory is in the "general JVM
classpath"; I don't find "classes" in the Java Class Path in the CF
Administrator's System Information page. And I have all the caching
options turned off on the "Server Settings > Caching" page, if
that has any bearing on it.
Are there any known issues around this dynamic reload
capability, or maybe a more definitive way to make sure the
WEB-INF/classes directory isn't in the classpath?
Thanks,
James

Yes, I understand. But if I'm reading it correctly, what
you're saying seems to contradict the documentation
http://livedocs.adobe.com/coldfusion/7/htmldocs/00001561.htm
ColdFusion dynamically loads classes that are either .class
files in the web_root/WEB-INF/classes directory or in JAR files in
the web_root/WEB-INF/lib directory. ColdFusion checks the time
stamp on the file when it creates an object that is defined in
either directory, even when the class is already in memory. If the
file that contains the class is newer than the class in memory,
ColdFusion loads the class from that directory.
http://kb.adobe.com/selfservice/viewContent.do?externalId=tn_18228&sliceId=1
Dynamic class reloading for Java servlets classes and
forcfobject (sic) Java classes is disabled by default in
ColdFusion MX. To enable dynamic class reloading, do the following:
Also, I seem to recall that setting worked in a prior
version. Though I would have to test it again on another machine to
be certain.

Loading class files

I've been having a problem with something I have been making and I need some help.
I want to have a user use a file chooser to choose a class file and my program will run it for them in an internal frame. I can do it if I write the class into the code like:
SomeClass Share = new SomeClass();
          JInternalFrame j = new JInternalFrame(Share.getTitle(), true, true, true, true);
          Toolkit theKit = j.getToolkit();
          Dimension wndSize = theKit.getScreenSize();
          j.setLocation(wndSize.width/4, (wndSize.height/4)-50);
          j.setSize(wndSize.width/2, (wndSize.height/2)+100);
          j.setContentPane(Share.getContentPane());
          j.setJMenuBar(Share.getJMenuBar());
          Share.dispose();
          j.setVisible(true);
          deskTop.add(jif);
But I want the user to be able to select what class goes in instead of SomeClass (as in the example)
I hope this made sense, but I really need the help! Thanks

If it's in the classpath & you remember to slice off the ".class" ending then buckman1's code should work well. However you may not be able to guarantee that the class is in the classpath! To do this use java.io to load the class file into a byte[] one way or another. Then use an instance of a subclass of ClassLoader (or SecureClassLoader) to load the class. This subclass must expose the method defineClass(String name, byte[] b, int off, int len) or equivalent so that you can load the class out of the byte array. Note that each instance of a class loader has it's own "namespace" for loaded classes! This may make it more tedious for you or be very useful if you need to load in two different classes called foo.class! (You will still have to use a common base class or interface.)

How to convert a .jsp to a .java/.class file for use in peoplesoft

Hi java/jsp experts,
I want to convert a .jsp to a .java/.class file. is there a tool available, please let me know if you have any pointers....
or can i do it manually:
these are a few lines that the .jsp contains, and i would like to translate this to be in .java/.class format:
<%@ page import="sun.misc.BASE64Encoder, javax.crypto., javax.crypto.spec."%>
<%@ page import="java.util.StringTokenizer" %>
<%@ page import="java.util.Map" %>
<%!
sb.append("<input type=\"hidden\" name=\"orderPage_serialNumber\" value=\"");
sb.append(serialNumber);
sb.append("\">\n");
return sb.toString();
%>
how can i translate the above import statements and html elements from jsp to java, please let me know.
Once i have the .java file created from the .jsp, I will compile .java to create the .class file and invoke the .class in peoplecode by using java apis available in peopletools.
Thanks in advance.

Is there a way convert a binary .exe file( compiled by
another compiler) into Java .class/.jar file ? Anyone
know of a free program that can do this?It's not possible. There are many decompilers and disassemblers for Java but nothing will take you from ANY binary to Java source. It would be the end of computing as we know it and the beginning of a new era -:)

Loading .class files for reflection

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