How can a MDB access filesystem?

Question

Hi,everyone. Should you help me resolve this problem?
<b>--How can a MDB access filesystem?</b>
SOURCE CODE:
public void onMessage(javax.jms.Message aMessage) {
try{
FileOutputStream fos = new FileOutputStream(new File("D:\\Temp\\a.nok"));
fos.write("testing".getBytes() );
fos.flush();
fos.close();
}catch(Exception e){
e.printStackTrace();
RESPONSE:
java.security.AccessControlException: access denied (java.io.FilePermission D:\Temp\a.nok write)
at java.security.AccessControlContext.checkPermission(AccessControlContext.java:270)
at java.security.AccessController.checkPermission(AccessController.java:401)
at java.lang.SecurityManager.checkPermission(SecurityManager.java:542)
at java.lang.SecurityManager.checkWrite(SecurityManager.java:975)
at java.io.FileOutputStream.<init>(FileOutputStream.java:169)
at java.io.FileOutputStream.<init>(FileOutputStream.java:131)
at neu.mid.mag.mlm.MsgMonitorBean.onMessage(MsgMonitorBean.java:51)
at com.sun.ejb.containers.MessageBeanContainer.onMessage(MessageBeanContainer.java:653)
at com.sun.ejb.containers.MessageBeanListenerConcurrent.onMessage(MessageBeanListenerConcurrent.java:20)
at com.sun.jms.client.SessionImpl.onSessionMessageListener(SessionImpl.java:981)
at com.sun.jms.client.SessionImpl.deliverMessage(SessionImpl.java:1072)
at com.sun.jms.client.JMSClientImpl.sendMessage(JMSClientImpl.java:149)
at org.omg.stub.com.sun.jms.client._JMSClientImpl_Tie._invoke(Unknown Source)
at com.sun.corba.ee.internal.corba.ServerDelegate.dispatch(ServerDelegate.java:350)
at com.sun.corba.ee.internal.iiop.ORB.process(ORB.java:250)
at com.sun.corba.ee.internal.iiop.LocalClientRequestImpl.invoke(LocalClientRequestImpl.java:96)
at com.sun.corba.ee.internal.corba.ClientDelegate.invoke(ClientDelegate.java:227)
at com.sun.corba.ee.internal.corba.ClientDelegate.invoke(ClientDelegate.java:269)
at org.omg.CORBA.portable.ObjectImpl._invoke(ObjectImpl.java:457)
at org.omg.stub.com.sun.jms._JMSClient_Stub.sendMessage(Unknown Source)
at com.sun.jms.service.ConnectionImpl.sendMessage(ConnectionImpl.java:475)
at com.sun.jms.service.SessionImpl.processOutgoingMessages(SessionImpl.java:1295)
at com.sun.jms.service.SessionImpl.access$000(SessionImpl.java:45)
at com.sun.jms.service.SessionImpl$1.activityDetected(SessionImpl.java:1014)
at com.sun.jms.util.WorkerThread.run(WorkerThread.java:87)

Answer 1

Hi,
Hi,everyone. Should you help me resolve this problem?
<b>--How can a MDB access filesystem?</b>
SOURCE CODE:
public void onMessage(javax.jms.Message aMessage)
ge) {
try{
FileOutputStream fos = new
m fos = new FileOutputStream(new
File("D:\\Temp\\a.nok"));
fos.write("testing".getBytes() );
fos.flush();
fos.close();
}catch(Exception e){
e.printStackTrace();
This is fine .......
RESPONSE:
java.security.AccessControlException: access denied
(java.io.FilePermission D:\Temp\a.nok write)
at
at
at
t
java.security.AccessControlContext.checkPermission(Acce
sControlContext.java:270)
at
at
at
t
java.security.AccessController.checkPermission(AccessCo
troller.java:401)
at
at
at
t
java.lang.SecurityManager.checkPermission(SecurityManag
r.java:542)
at
at
at
t
java.lang.SecurityManager.checkWrite(SecurityManager.ja
a:975)
at
at
at
t
java.io.FileOutputStream.<init>(FileOutputStream.java:1
9)
at
at
at
t
java.io.FileOutputStream.<init>(FileOutputStream.java:1
1)
at
at
at
t
neu.mid.mag.mlm.MsgMonitorBean.onMessage(MsgMonitorBean
java:51)
at
at
at
t
com.sun.ejb.containers.MessageBeanContainer.onMessage(M
ssageBeanContainer.java:653)
at
at
at
t
com.sun.ejb.containers.MessageBeanListenerConcurrent.on
essage(MessageBeanListenerConcurrent.java:20)
at
at
at
t
com.sun.jms.client.SessionImpl.onSessionMessageListener
SessionImpl.java:981)
at
at
at
t
com.sun.jms.client.SessionImpl.deliverMessage(SessionIm
l.java:1072)
at
at
at
t
com.sun.jms.client.JMSClientImpl.sendMessage(JMSClientI
pl.java:149)
at
at
at
t
org.omg.stub.com.sun.jms.client._JMSClientImpl_Tie._inv
ke(Unknown Source)
at
at
at
t
com.sun.corba.ee.internal.corba.ServerDelegate.dispatch
ServerDelegate.java:350)
at
at
at
t
com.sun.corba.ee.internal.iiop.ORB.process(ORB.java:250
at
at
at
t
com.sun.corba.ee.internal.iiop.LocalClientRequestImpl.i
voke(LocalClientRequestImpl.java:96)
at
at
at
t
com.sun.corba.ee.internal.corba.ClientDelegate.invoke(C
ientDelegate.java:227)
at
at
at
t
com.sun.corba.ee.internal.corba.ClientDelegate.invoke(C
ientDelegate.java:269)
at
at
at
t
org.omg.CORBA.portable.ObjectImpl._invoke(ObjectImpl.ja
a:457)
at
at
at
t
org.omg.stub.com.sun.jms._JMSClient_Stub.sendMessage(Un
nown Source)
at
at
at
t
com.sun.jms.service.ConnectionImpl.sendMessage(Connecti
nImpl.java:475)
at
at
at
t
com.sun.jms.service.SessionImpl.processOutgoingMessages
SessionImpl.java:1295)
at
at
at
t
com.sun.jms.service.SessionImpl.access$000(SessionImpl.
ava:45)
at
at
at
t
com.sun.jms.service.SessionImpl$1.activityDetected(Sess
onImpl.java:1014)
at
at
at
t
com.sun.jms.util.WorkerThread.run(WorkerThread.java:87)
First of all in the specificaitons it is recommended not to use the i/o with ejb.So you should avoid doing same.
Now the exception you are getting is due to the SecurityManager at the server side JVM.In order to make it run you have to modify the java.policy file present with in the JAVA_HOME/jre/lib/security.
With in this file you add the following entry
permission java.io.FilePermission "D:\\Temp\\a.nok", "read,write";
For more details you should refer to the concept of the Security Manager which is not loaded by default in java app but in applets and in server side applications it is made for security purposes.
Regards
Vicky