Declarative java object cache in non oc4j container
hello,
i'm trying to use the cache.jar from 10g in a standalone application.
i've followed the j2ee services guide and use cache.open(path_to_javacache.xml). javacache.xml has preload-file defined, in which i've declared my userdefined classloader and userdefined cached object. the implementations of both implement declarable. however,when i use cacheaccess.getaccess(region_name) i get regionnotfoundexception.
i've also tried to use the configurator alternative, where i specify the declarative cache xml file. but this gives me a classcastexception.
any suggestions. better yet is there a sample program that
shows the use of a decl cache in a non oc4j container.
thanks
Hi,
I ran into the same problem while evaluating OC4J V9 Java Cache standalone.
Cache.open() silently ignores errors:
* Cache.open(path_to_javacache.xml) seems to silently swallow alle error messages (in your case the ClassCastException) and the ignore the configuration file
* so to get meaningful error messages, first attempt to open the file with new Configurator(path_to_javacache.xml)
* once there are no more errors, you can open it with Cache.open(path_to_javacache.xml)
Now, to get around the ClassCastException:
* you need to add xmlparserv2.jar from your oc4j distribution
* this must be the first xml-parser in your classpath (when e.g. xerces.jar comes first, you will get a ClassCastException)
A relative javacache.xml is relative to your working directory.
The preload-file - Path seems to be relative to the javacache.xml path, if it is not absolute. I keep javacache.xml and preload-file together which worked for me.
Hope this help,
Andreas
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06/01/05 15:54:14 at java.lang.Thread.dumpStack(Thread.java:1064)
06/01/05 15:54:14 at uk.ac.ebi.submission.util.CountryCacheLoader.load(Unknown Source)
06/01/05 15:54:14 at oracle.ias.cache.CacheLoader.callLoad(Unknown Source)
06/01/05 15:54:14 at oracle.ias.cache.CacheHandle.findObject(Unknown Source)
06/01/05 15:54:14 at oracle.ias.cache.CacheHandle.asyncLoad(Unknown Source)
06/01/05 15:54:14 at oracle.ias.cache.Task.execute(Unknown Source)
06/01/05 15:54:14 at oracle.ias.cache.WorkerThread.run(Unknown Source)
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06/01/05 15:54:14 load entred for country cache loader Thu Jan 05 15:54:14 GMT 2006
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06/01/05 15:54:14 at java.lang.Thread.dumpStack(Thread.java:1064)
06/01/05 15:54:14 at uk.ac.ebi.submission.util.CountryCacheLoader.load(Unknown Source)
06/01/05 15:54:14 at oracle.ias.cache.CacheLoader.callLoad(Unknown Source)
06/01/05 15:54:14 at oracle.ias.cache.CacheHandle.findObject(Unknown Source)
06/01/05 15:54:14 at oracle.ias.cache.CacheHandle.locateObject(Unknown Source)
06/01/05 15:54:14 at oracle.ias.cache.CacheAccess.get(Unknown Source)
06/01/05 15:54:14 at uk.ac.ebi.submission.ejb.session.WebinUtilBean.getCountries(Unknown Source)
06/01/05 15:54:14 at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
06/01/05 15:54:14 at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
06/01/05 15:54:14 at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
06/01/05 15:54:14 at java.lang.reflect.Method.invoke(Method.java:324)
06/01/05 15:54:14 at com.evermind.server.ejb.interceptor.EJBJoinPointImpl.invoke(EJBJoinPointImpl.java:39)
06/01/05 15:54:14 at com.evermind.server.ejb.interceptor.InvocationContextImpl.proceed(InvocationContextImpl.java:45)
06/01/05 15:54:14 at com.evermind.server.ejb.interceptor.system.DMSInterceptor.invoke(DMSInterceptor.java:62)
06/01/05 15:54:14 at com.evermind.server.ejb.interceptor.InvocationContextImpl.proceed(InvocationContextImpl.java:43)
06/01/05 15:54:14 at com.evermind.server.ejb.interceptor.system.JAASInterceptor$1.run(JAASInterceptor.java:32)
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06/01/05 15:54:14 at com.evermind.server.ejb.interceptor.system.JAASInterceptor.invoke(JAASInterceptor.java:36)
06/01/05 15:54:14 at com.evermind.server.ejb.interceptor.InvocationContextImpl.proceed(InvocationContextImpl.java:43)
06/01/05 15:54:14 at com.evermind.server.ejb.interceptor.system.TxRequiredInterceptor.invoke(TxRequiredInterceptor.java:56)
06/01/05 15:54:14 at com.evermind.server.ejb.interceptor.InvocationContextImpl.proceed(InvocationContextImpl.java:43)
06/01/05 15:54:14 at com.evermind.server.ejb.interceptor.system.SecurityRoleInterceptor.invoke(SecurityRoleInterceptor.java:46)
06/01/05 15:54:14 at com.evermind.server.ejb.interceptor.InvocationContextImpl.proceed(InvocationContextImpl.java:43)
06/01/05 15:54:14 at com.evermind.server.ejb.interceptor.system.DMSInterceptor.invoke(DMSInterceptor.java:62)
06/01/05 15:54:14 at com.evermind.server.ejb.interceptor.InvocationContextImpl.proceed(InvocationContextImpl.java:43)
06/01/05 15:54:14 at com.evermind.server.ejb.interceptor.system.RunningStateInterceptor.invoke(RunningStateInterceptor.java:28)
06/01/05 15:54:14 at com.evermind.server.ejb.interceptor.InvocationContextImpl.proceed(InvocationContextImpl.java:43)
06/01/05 15:54:14 at com.evermind.server.ejb.StatelessSessionEJBObject.OC4J_invokeMethod(StatelessSessionEJBObject.java:106)
06/01/05 15:54:14 at WebinUtilLocal_StatelessSessionBeanWrapper50.getCountries(WebinUtilLocal_StatelessSessionBeanWrapper50.java: 310)
06/01/05 15:54:14 at uk.ac.ebi.submission.cactus.session.WebinUtilTest.testGetCountries(Unknown Source)
06/01/05 15:54:14 at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
06/01/05 15:54:14 at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
06/01/05 15:54:14 at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
06/01/05 15:54:14 at java.lang.reflect.Method.invoke(Method.java:324)
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06/01/05 15:54:14 at org.apache.cactus.server.ServletTestRedirector.doPost_aroundBody2(ServletTestRedirector.java:101)
06/01/05 15:54:14 at org.apache.cactus.server.ServletTestRedirector.doPost_aroundBody3$advice(ServletTestRedirector.java:224)
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06/01/05 15:54:14 at com.evermind.server.http.ServletRequestDispatcher.forwardInternal(ServletRequestDispatcher.java:397)
06/01/05 15:54:14 at com.evermind.server.http.HttpRequestHandler.doProcessRequest(HttpRequestHandler.java:833)
06/01/05 15:54:14 at com.evermind.server.http.HttpRequestHandler.processRequest(HttpRequestHandler.java:430)
06/01/05 15:54:14 at com.evermind.server.http.HttpRequestHandler.serveOneRequest(HttpRequestHandler.java:216)
06/01/05 15:54:14 at com.evermind.server.http.HttpRequestHandler.run(HttpRequestHandler.java:119)
06/01/05 15:54:14 at com.evermind.server.http.HttpRequestHandler.run(HttpRequestHandler.java:112)
06/01/05 15:54:14 at oracle.oc4j.network.ServerSocketReadHandler$SafeRunnable.run(ServerSocketReadHandler.java:215)
06/01/05 15:54:14 at oracle.oc4j.network.ServerSocketAcceptHandler.procClientSocket(ServerSocketAcceptHandler.java:232)
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06/01/05 15:54:14 at oracle.oc4j.network.ServerSocketAcceptHandler$AcceptHandlerHorse.run(ServerSocketAcceptHandler.java:819)
06/01/05 15:54:14 at com.evermind.util.ReleasableResourcePooledExecutor$MyWorker.run(ReleasableResourcePooledExecutor.java:303)
06/01/05 15:54:14 at java.lang.Thread.run(Thread.java:534)
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result = response.readObject();
if( result!=null && (result instanceof DataVO))
dvo = (DataVO)result;
String vo = dvo.printDataVO();
System.out.println("*DataVO*\n"+vo);
else
System.out.println("not an instanceof DataVO");
catch(IOException ignored)
System.out.println("Error in DataVO response");
ignored.printStackTrace();
Here's the code in the JSP sending the response back to the applet. The 'dvo'
object is the object which is serialized and has gets and sets for the diff. data
elements. When I print the 'dvo' before writing the object to outputStream it
prints the correct values for the data element.
// send response
response.setStatus(HttpServletResponse.SC_OK);
ObjectOutputStream outputStream = new ObjectOutputStream (new BufferedOutputStream
(response.getOutputStream()));
outputStream.writeObject(dvo);
outputStream.flush();
ERROR is as follows:
Error in DataVO response
java.io.StreamCorruptedException: InputStream does not contain a serialized object
at java/io/ObjectInputStream.readStreamHeader
at java/io/ObjectInputStream.<init>
What am I doing wrong?. Please respond soon. The applet is run on IIS and the
JSP in on weblogic 6.1. I'm not sure if that makes any difference.
I have an applet which calls a JSP to write data object to the db and then the
JSP sends back the updated data object. The writing part is ok but the response
is giving the following error. The data object is in a separate class which implements
Serialized.
Here's the code in the applet calling the JSP and the response from the JSP
URL server = null;
String urlConnectionString = "http://localhost:7001/isLoginValid.jsp";
try
server = new URL(urlConnectionString);
catch(MalformedURLException e)
System.out.println("URL exception: " + e );
// send request
ObjectInputStream response = null;
Object result = null;
try
URLConnection conn = server.openConnection();
conn.setDoOutput(true);
conn.setUseCaches(false);
conn.setRequestProperty("Content-Type", "application/octet-stream");
ObjectOutputStream request = new ObjectOutputStream(new
BufferedOutputStream(conn.getOutputStream()));
request.writeObject((Object)dvo);
request.flush();
request.close();
// get the result input stream
response = new ObjectInputStream(new BufferedInputStream
(conn.getInputStream()));
// read response back from the server
result = response.readObject();
if( result!=null && (result instanceof DataVO))
dvo = (DataVO)result;
String vo = dvo.printDataVO();
System.out.println("*DataVO*\n"+vo);
else
System.out.println("not an instanceof DataVO");
catch(IOException ignored)
System.out.println("Error in DataVO response");
ignored.printStackTrace();
Here's the code in the JSP sending the response back to the applet. The 'dvo'
object is the object which is serialized and has gets and sets for the diff. data
elements. When I print the 'dvo' before writing the object to outputStream it
prints the correct values for the data element.
// send response
response.setStatus(HttpServletResponse.SC_OK);
ObjectOutputStream outputStream = new ObjectOutputStream (new BufferedOutputStream
(response.getOutputStream()));
outputStream.writeObject(dvo);
outputStream.flush();
ERROR is as follows:
Error in DataVO response
java.io.StreamCorruptedException: InputStream does not contain a serialized object
at java/io/ObjectInputStream.readStreamHeader
at java/io/ObjectInputStream.<init>
What am I doing wrong?. Please respond soon. The applet is run on IIS and the
JSP in on weblogic 6.1. I'm not sure if that makes any difference.
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