Linkage Error using Entity Resolver

Hello,
I'm working on a project that requires the use of an alternate JAXP
parser implementation than what comes default with weblogic 6.1 (I'm
using crimson). However, I'm getting a LinkageError when I try to use
my code. The same code that gets this error is working fine on Weblogic
5.1 (see exception below).
It appears that there is some problem with the classloader hierarchy
from what I can tell. I've tried defining a new XML service via the WL
GUI with specific entries for my entities and have mapped these settings
to my server, all to no avail.
The problem appears to be appearing when I load my custom Entity
Resolver which uses my own caching mechanism. For my own sanity, I do
not want to be tightly coupled to the entity caching mechanism in WL 6.1
and like I said this worked fine on 5.1. It appears that the
LinkageException is complaining that the version of EntityResolver
interface compiled against my class is not compatible with runtime
version available.
<Nov 19, 2001 3:03:01 PM CST> <Error> <HTTP>
<[WebAppServletContext(7574644,gmlc,/gmlc)] Servlet failed with
Exception
java.lang.LinkageError: loader constraints violated when linking
org/xml/sax/EntityResolver class
at
com.nokia.gmlc.lcs.nokiaapi.NokiaRequestParser.parse(NokiaRequestParser.java:101)
at com.nokia.gmlc.lcs.nokiaapi.NokiaApi.doPost(NokiaApi.java:88)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:760)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at
weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java:265)
at
weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java:200)
at
weblogic.servlet.internal.WebAppServletContext.invokeServlet(WebAppServletContext.java:
2456)
at
weblogic.servlet.internal.ServletRequestImpl.execute(ServletRequestImpl.java:2039)
at weblogic.kernel.ExecuteThread.execute(ExecuteThread.java:139)
at weblogic.kernel.ExecuteThread.run(ExecuteThread.java:120)
>
I'm really frustrated by this one. I've lost nearly 2 days trying to
figure this one out. Any help would be appreciated.
What I've tried:
Adding custom JAXP classes to WL GUI and linking to server.
Adding custom JAXP classes per entity and linknig to server.
Mucking around with class paths, etc.
Adding PreferWebInfClasses="true" to config.xml so my libraries would be
used before system libraries.
Thanks for any help,
Dan Flynn
[email protected]

Ok, this could be an issue with start-up options being different with Sun Hotspot and BEA JRockit. When the server running JRockit is started, it usually prints its command line, could you try to capture it and post it into this news thread? Also specify which version of JRockit you are using (you could specify -showversion on the command line paste the output in this thread).
Kind regards,
Cecilia Borg
BEA WebLogic JRockit

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tnx..
addi

Is ConnectionPool in this "cal" package as well as PooledConnection? From the directory you are compiling from it appears that it is. If it is, then you are compiling it incorrectly. To compile ConnectionPool (and PooledConnection similarly), you must change the current directory to the one that contains cal and type
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          Rajesh <[email protected]> escribió en el mensaje de noticias
          [email protected]...
          >
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          > similar to below classes for which the I got Linkage error.
          >
          > question is why would weblogic look for
          weblogic.jdbc20.common.internal.RmiDataSource.getConnection
          > ( (this class resides in c:\weblogic452\classes dir and not in
          c:\weblogic452\classes\boot
          > which is there in system classpath)of /weblogic452 directory when I am not
          even
          > booting up 4.5.2 instance of the server.
          >
          > >java.lang.LinkageError: Class java/sql/Connection violates loader
          constraints
          > > at
          >weblogic.jdbc20.common.internal.RmiDataSource.getConnection(RmiDataSource.j
          ava:53)
          >
          >
          > "Rajesh" <[email protected]> wrote:
          > >
          > >Hi,
          > >
          > >In my webApp I bumped into following Exception while running JSPs which
          > >queries
          > >database.
          > >
          > >Platform : Windows NT 4, webLogic 5.1 with SP 8.
          > >Action : WLSServer crashes with Dr. Watson application error.
          > >
          > >I am using a custom Connect.java class ( through javax.sql.DataSource,
          > >as recommended
          > >by WLS 5.1 docs ) to connect to Oracle database using JDBC thin client.
          > >If I do
          > >not use webApp architecture then the same class works good to connect
          > >to DB.
          > >
          > >Also, if I maintain identical class hierachy into my weblogic.class.path
          > >classpath
          > >settings I do not get this exception and everything works fine.
          > >
          > >I read into this search group messages about Linkage problems caused
          > >because of
          > >having duplicate classes available to the server at runtime and so I
          > >ensured that
          > >I do not keep classpaths which can cause duplicate classes into runtime
          > >environment
          > >of wlsserver but still the same problem persists.
          > >
          > >any help is appreciated,
          > >
          > >thanks,
          > >
          > >- Rajesh.
          > >
          > >------------------
          > >
          > >Mon Apr 02 16:19:11 PDT 2001:<I> <WebAppServletContext-eTools> Generated
          > >java
          > >file:
          c:\project\etools\WEB-INF\_tmp_war_eTools\jsp_servlet\_jsp\_xyz.java
          > >Mon Apr 02 16:19:13 PDT 2001:<E> <WebAppServletContext-eTools> Servlet
          > >failed
          > >with Exception
          > >java.lang.LinkageError: Class java/sql/Connection violates loader
          constraints
          > > at
          weblogic.jdbc20.common.internal.RmiDataSource.getConnection(RmiDataSource.ja
          va:53)
          > > at
          weblogic.jdbc20.common.internal.RmiDataSource_ServiceStub.getConnection(RmiD
          ataSource_ServiceStub.java,
          > >Compiled Code)
          > > at com.bea.etools.common.Connect.getConnection(Connect.java:51)
          > > at jsp_servlet._jsp._xyz._jspService(_xyz.java, Compiled Code)
          > > at weblogic.servlet.jsp.JspBase.service(JspBase.java:27)
          > > at
          weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java
          :106)
          > > at
          weblogic.servlet.internal.ServletContextImpl.invokeServlet(ServletContextImp
          l.java:907)
          > > at
          weblogic.servlet.internal.ServletContextImpl.invokeServlet(ServletContextImp
          l.java:851)
          > > at
          weblogic.servlet.internal.ServletContextManager.invokeServlet(ServletContext
          Manager.java:252)
          > > at
          weblogic.socket.MuxableSocketHTTP.invokeServlet(MuxableSocketHTTP.java:364)
          > > at
          weblogic.socket.MuxableSocketHTTP.execute(MuxableSocketHTTP.java:252)
          > > at weblogic.kernel.ExecuteThread.run(ExecuteThread.java, Compiled
          > >Code)
          >

How to handle "The specified resource does not exist" exception while using entity group transactions to purge WADLogs table

Hi,
We have a requirement to purge the Azure WADLogs table on a periodic basis. We are achieving this by using Entity group transactions to delete the
records older than 15 days. The logic is like this.
bool recordDoesNotExistExceptionOccured = false;
CloudTable wadLogsTable = tableClient.GetTableReference(WADLogsTableName);
partitionKey = "0" + DateTime.UtcNow.AddDays(noOfDays).Ticks;
TableQuery<WadLogsEntity> buildQuery = new TableQuery<WadLogsEntity>().Where(
TableQuery.GenerateFilterCondition("PartitionKey",
QueryComparisons.LessThanOrEqual, partitionKey));
while (!recordDoesNotExistExceptionOccured)
IEnumerable<WadLogsEntity> result = wadLogsTable.ExecuteQuery(buildQuery).Take(1000);
//// Batch entity delete.
if (result != null && result.Count() > 0)
Dictionary<string, TableBatchOperation> batches = new Dictionary<string, TableBatchOperation>();
foreach (var entity in result)
TableOperation tableOperation = TableOperation.Delete(entity);
if (!batches.ContainsKey(entity.PartitionKey))
batches.Add(entity.PartitionKey, new TableBatchOperation());
// A Batch Operation allows a maximum 100 entities in the batch which must share the same PartitionKey.
if (batches[entity.PartitionKey].Count < 100)
batches[entity.PartitionKey].Add(tableOperation);
// Execute batches.
foreach (var batch in batches.Values)
try
await wadLogsTable.ExecuteBatchAsync(batch);
catch (Exception exception)
// Log exception here.
// Set flag.
if (exception.Message.Contains(ResourceDoesNotExist))
recordDoesNotExistExceptionOccured = true;
break;
else
break;
My questions are:
Is this an efficient way to purge the WADLogs table? If not, what can make this better?
Is this the correct way to handle the "Specified resource does not exist exception"? If not, how can I make this better?
Would this logic fail in any particular case?
How would this approach change if this code is in a worker which has multiple instances deployed?
I have come up with this code by referencing the solution given
here by Keith Murray.

Hi Nikhil,
Thanks for your posting!
I tested your and Keith's code on my side, every thing worked fine. And when result is null or "result.count()<0", the While() loop is break. I found you code had some logic to handle the error "ResourceDoesNotExist" .
It seems that the code worked fine. If you always occurred this error, I suggest you could debug your code and find which line of code throw the exception.
>> Is this an efficient way to purge the WADLogs table? If not, what can make this better?
Base on my experience, we could use code (like the above logic code) and using the third party tool to delete the entities manually. In my opinion, I think the code is every efficient, it could be auto-run and save our workload.
>>Is this the correct way to handle the "Specified resource does not exist exception"? If not, how can I make this better?
In you code, you used the "recordDoesNotExistExceptionOccured " as a flag to check whether the entity is null. It is a good choice. I had tried to deleted the log table entities, but I used the flag to check the result number.
For example, I planed the query result count is 100, if the number is lower than 100, I will set the flag as false, and break the while loop.
>>Would this logic fail in any particular case?
I think it shouldn't fail. But if the result is "0", your while loop will always run. It will never stop. I think you could add "recordDoesNotExistExceptionOccured
= true;" into your "else" block.
>>How would this approach change if this code is in a worker which has multiple instances deployed?
You don't change anything expect the "else" block. It would work fine on the worker role.
If any question about this issue, please let me know free.
Regards,
Will
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Since I updated Firefox 4, I cannot open any attachments in my Gmail, whether Word or PDF files, I can only view them. When trying to download attachments I get an error message: "XML Parsing Error:undefined entity. Help!

The full error message is the following:
XML Parsing Error: Undefined entity
Location chrome://mozapps/content/downloads/unknown content type.xul
Line Number 30, Column 18

In order to use ''nxm://'' links, Nexus Mod Manager must be installed and associated with the ''nxm'' protocol.
* http://www.nexusmods.com/skyrim/mods/modmanager/
In case of problems with this third-party program, please refer to its support forum:
* http://forums.nexusmods.com/index.php?/forum/1413-nmm-code-development-chat

JAVAMAP-Sax Parser ...............Linkage error when loading the class.

Dear all,
Do we have any extra things to execute the Java mapping using the Sax Parser?
When I am executing the interface mapping ,I am getting the" Linkage error when loading the class" error.
Kindly let me know your personnel maildId so that I can mail you the screen shots.
Thanks,
Srinivasa

Dear sunil,
Find the File.
Source:
<MTO_FTP_MAT_DETAILS>
<MATDETAILS>
<MAKTX>
<MATNR>
<WERKS>
<LABST>
<MEINS>
<PERCNT>
TARGET
MTI_FTP_MAT_DETAILS
<MATDETAILS>
<MAKTX>
<MATNR>
<WERKS>
<LABST>
<MEINS>
<PERCNT>
Source:
<MTO_FTP_MAT_DETAILS>
<MATDETAILS>
<MAKTX>
<MATNR>
<WERKS>
<LABST>
<MEINS>
<PERCNT>
TARGET
MTI_FTP_MAT_DETAILS
<MATDETAILS>
<MAKTX>
<MATNR>
<WERKS>
<LABST>
<MEINS>
<PERCNT>
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.Map;
import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;
import org.xml.sax.Attributes;
import org.xml.sax.SAXException;
import org.xml.sax.helpers.DefaultHandler;
import com.sap.aii.mapping.api.StreamTransformation;
class Echo {
public static OutputStream out;
public class myEcho extends DefaultHandler implements StreamTransformation {
private Map map;
public void setParameter(Map param) {
map = param;
public void execute(InputStream in, OutputStream out) {
DefaultHandler handler = this;
SAXParserFactory factory = SAXParserFactory.newInstance();
try {
SAXParser saxParser = factory.newSAXParser();
Echo.out = out;
saxParser.parse(in, handler);
} catch (Throwable t) {
t.printStackTrace();
public void startDocument() throws SAXException {
try {
Echo.out.write("<?xml version='1.0' encoding='UTF-8'?>".getBytes());
} catch (IOException e) {
e.notify();
public void endDocument() throws SAXException {
try {
Echo.out.flush();
} catch (IOException e) {
throw new SAXException("I/O error", e);
public void startElement(String namespaceURI, String sName, // simple name
String qName, // qualified name
Attributes attrs) throws SAXException {
String eName = sName; // element name
if ("".equals(eName))
eName = qName; // not namespace-aware
if ("ns0:MTO_SAP_MAT_DETAILS".equals(qName)) {
try {
Echo.out.write(("<MTI_FTP_MAT_DETAILS>").getBytes());
} catch (Exception e) {
e.printStackTrace();
} else {
try {
Echo.out.write(("<" + qName + ">").getBytes());
} catch (Exception e) {
e.printStackTrace();
public void endElement(String namespaceURI, String sName, // simple name
String qName // qualified name
) throws SAXException {
String eName = sName; // element name
if ("".equals(eName))
eName = qName; // not namespace-aware
if ("ns0:MTO_SAP_MAT_DETAILS".equals(qName)) {
try {
Echo.out.write(("</MTI_FTP_MAT_DETAILS>").getBytes());
} catch (Exception e) {
e.printStackTrace();
} else {
try {
Echo.out.write(("</" + qName + ">").getBytes());
} catch (Exception e) {
e.printStackTrace();
public void characters(char buf[], int offset, int len)
throws SAXException {
String s = new String(buf, offset, len);
try {
Echo.out.write(s.getBytes());
} catch (Exception e) {
e.printStackTrace();

Error "Cannot be resolved to a type" on OwnerPIN, APDU, ISO7816

The error I'm reffering to might clearify the fact that I'm new at Java/javaCard-development.
To learn how it all works I've downloaded an example and try to understand what happens.
I opened the source in Eclipse and get errors "Cannot be resolved to a type" on OwnerPIN, ADPU and ISO7816 classes. I have an Import javacard.framework statement and expected these types to be part of this library.
I guess I'm forgetting something somewhere but couldn't find the soluiton on internet.
import javacard.framework.*; // import all neccessary packages for java card*
import java.applet.;
import java.lang.Object;
public class classpgdata extends Applet {
final static byte PROP_CLASS = (byte) 0x80; // Class of the proprietary APDU commands
static {color:#ff0000}OwnerPIN{color} pin; // the PIN object
public void process({color:#ff0000}APDU{color} apdu) {
byte[] cmd_apdu = apdu.getBuffer();
if (cmd_apdu[{color:#ff0000}ISO7816{color}.OFFSET_CLA] == {color:#ff0000}ISO7816{color}.CLA_ISO7816) {
//----- it is the ISO/IEC 7816 class
switch(cmd_apdu[{color:#ff0000}ISO7816{color}.OFFSET_INS]) { // check the instruction byte
case INS_SELECT: // it is a SELECT FILE instruction
...

Hi,
What you need to do update your Java build path fr the project in your Eclipse project.
Project -> Properties then find Java Build Path.
In the Libraries tab add the {JCDK Home}/lib/javacardframework.jar by clicking the add external JARs button. You may also want to remove the standard Java Runtime (JRE) libraries as you do not build against these.
If you want to use the JC 2.2.1 CAP file converter, you may also want to ensure that the Eclipse compiler is set to compile as Java 1.3 in the Java Compiler section of the project properties.
KeesdeVink wrote:
import javacard.framework.*; // import all neccessary packages for java card
import java.applet.*;
import java.lang.Object;
It also looks like you have added two imports you don't actually want. You only need the javacard.framework.* import.
Cheers,
Shane
Edited by: safarmer on 23/09/2009 08:00

Linkage Error using Entity Resolver

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