getting error when applet access port of tomcat.

**anchitanc** · 03-16-2012, 11:26 AM

hi all,
i have applet and i am trying to access url to get some result. this url is basically contain localhost:8080 (i am using tomcat).
i am getting error is :-

Java Code:

java.security.AccessControlException: access denied (java.net.SocketPermission l
ocalhost:8080 connect,resolve)
        at java.security.AccessControlContext.checkPermission(AccessControlConte
xt.java:323)
        at java.security.AccessController.checkPermission(AccessController.java:
546)
        at java.lang.SecurityManager.checkPermission(SecurityManager.java:532)
        at java.lang.SecurityManager.checkConnect(SecurityManager.java:1034)
        at sun.net.www.http.HttpClient.openServer(HttpClient.java:527)
        at sun.net.www.http.HttpClient.<init>(HttpClient.java:233)
        at sun.net.www.http.HttpClient.New(HttpClient.java:306)
        at sun.net.www.http.HttpClient.New(HttpClient.java:323)
        at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLC
onnection.java:860)
        at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConne
ction.java:801)
        at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection
.java:726)
        at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLCon
nection.java:1049)
        at java.net.URL.openStream(URL.java:1010)
        at AccessPointClient.getStream(AccessPointClient.java:157)
        at AccessPointClient.issueRequest(AccessPointClient.java:181)
        at AccessPointClient.login(AccessPointClient.java:90)
        at ApointTest.getData(ApointTest.java:84)
        at ApointTest.init(ApointTest.java:53)
        at sun.applet.AppletPanel.run(AppletPanel.java:424)
        at java.lang.Thread.run(Thread.java:619)
java.lang.NullPointerException
        at ApointTest.printData(ApointTest.java:95)
        at ApointTest.init(ApointTest.java:62)
        at sun.applet.AppletPanel.run(AppletPanel.java:424)
        at java.lang.Thread.run(Thread.java:619)

and my applet code is like:-

Java Code:

String uri = "http://localhost:8080/myapplication";

when i run my application in eclipse it works fine but when i try to access in browser it give me this error.

all jar which i am using in my application are signed.

thanks
Anchit

**Norm** · 03-17-2012, 07:51 PM

Is there more than one jar file?

For testing, can you make a small,simple program that tries to connect, put it in a jar file, sign that jar file and load it in the browser?

**anchitanc** · 03-22-2012, 11:23 AM

hi norm,

yes i am working with 4 .jar file ....
and i tried with small program .. but this not working.

main thing is, i started tomcat and run application(is used to fetch data from database). i am get data by drafting URL in applet any use that URL to get data and display in database.

i think this error about, access "localhost:8080" in applet program:-
java.security.AccessControlException: access denied (java.net.SocketPermission l
ocalhost:8080 connect,resolve)

thanks for reply norm

**Norm** · 03-22-2012, 12:16 PM

How are you loading the html with the applet into the browser? What URL are you using in the browser?
For testing the Socket permission problem, a small simple program would be the easiest. When you get that to work then you will be able to work on the real program.

**anchitanc** · 03-22-2012, 12:51 PM

i try open this file by two ways:-
1. by open this file locally(just double click on .html file name which i write the code below) // here it give me warning message because i am having some signed .jar file
2. by open this file as "appletviewer http://localhost:8080/myapp/index1.html" // here i am getting error which i mention in my last post.
my applet code :-
file name :- index1.html

Java Code:

<body>

<applet code="Test1.class" archive="first.jar" height="200" width="200">

</applet><br>
</body>

and code for test1.class is :-

Java Code:

public void init()
	{

String uri = "http://localhost:8080/myapp1/url_for_get_some_data";	    	
// i am sending this url to other class which will fetch data from my application which is running on tomcat server
// that application have some logic to retrieve data from database and pass this to applet and applet will show that data 
//in browser or appletviewer
	   }

i hope this will help you to understand my problem.
please let me know if you any problem to understand.

thanks for reply norm.

**Norm** · 03-22-2012, 12:57 PM

by open this file locally(just double click on .html file

You need to load the html with the applet from the server using the http protocol.
You are loading the file from a local disk using the file: protocol.

An applet can only connect to a server it was loaded from. Loading it from a disk file is not connecting to a server.
Use a URL with http://localhost:8080/htmlfilename.html to load the applet from the server.

**anchitanc** · 03-22-2012, 01:03 PM

ya that is right .. got it ..
but i am still getting same error.

can you please suggest me how to use tomcat port in my program.

**Norm** · 03-22-2012, 01:42 PM

How are you now loading the html page with the applet in the browser?

**anchitanc** · 03-22-2012, 02:34 PM

i tried with the both ..
with browser :- not giving error and not a output.
in appletviewer:- error only.

**anchitanc** · 03-22-2012, 02:43 PM

i tried same with JBOSS (put my application in JOSS which i was using with tomcat, with no change in applet and java code) also .. here i am getting correct output in browser without any error.
and when i tried same thing with appletviewer i got this new error:-

Java Code:

appletviewer http://10.253.193.82:8080/myapp1/index1.html

*** attempt to login ***

java.lang.ExceptionInInitializerError
        at sun.misc.Unsafe.ensureClassInitialized(Native Method)
        at sun.reflect.UnsafeFieldAccessorFactory.newFieldAccessor(UnsafeFieldAc
cessorFactory.java:25)
        at sun.reflect.ReflectionFactory.newFieldAccessor(ReflectionFactory.java
:122)
        at java.lang.reflect.Field.acquireFieldAccessor(Field.java:918)
        at java.lang.reflect.Field.getFieldAccessor(Field.java:899)
        at java.lang.reflect.Field.getLong(Field.java:528)
        at java.io.ObjectStreamClass.getDeclaredSUID(ObjectStreamClass.java:1614
)
        at java.io.ObjectStreamClass.access$700(ObjectStreamClass.java:52)
        at java.io.ObjectStreamClass$2.run(ObjectStreamClass.java:425)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.io.ObjectStreamClass.<init>(ObjectStreamClass.java:413)
        at java.io.ObjectStreamClass.lookup(ObjectStreamClass.java:310)
        at java.io.ObjectStreamClass.initNonProxy(ObjectStreamClass.java:547)
        at java.io.ObjectInputStream.readNonProxyDesc(ObjectInputStream.java:158
3)
        at java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1496)
        at java.io.ObjectInputStream.readNonProxyDesc(ObjectInputStream.java:158
3)
        at java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1496)
        at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1
732)
        at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1329)
        at java.io.ObjectInputStream.readArray(ObjectInputStream.java:1667)
        at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1323)
        at java.io.ObjectInputStream.readObject(ObjectInputStream.java:351)
        at test2.issueRequest(test2.java:210)
        at test2.login(test2.java:92)
        at test1.getData(test1.java:84)
        at test1.init(test1.java:53)
        at sun.applet.AppletPanel.run(test1.java:424)
        at java.lang.Thread.run(Thread.java:619)
        ... 28 more

**Norm** · 03-22-2012, 03:09 PM

i am getting correct output in browser without any error.

I'd recommend that you use the browser.

**anchitanc** · 03-22-2012, 03:52 PM

:) ya that is great option but ..... i need to use appletviewer.
can please give me some idea about those errors. why i am getting?
please suggest me if you have any idea about this.

**Norm** · 03-22-2012, 04:02 PM

Why does the code work in the browser and not in appletviewer? The error comes from the readObject() method call.
Are they using the same version of java?

**anchitanc** · 03-22-2012, 04:14 PM

yes...

**Norm** · 03-22-2012, 04:15 PM

Browser vs av

**anchitanc** · 03-22-2012, 04:21 PM

i have no idea why i am seeing this error ....

**Norm** · 03-22-2012, 04:31 PM

I don't know why it works in the browser and fails in appletviewer if they use the same URL and the same version of java.

**anchitanc** · 03-22-2012, 05:27 PM

thanks norm .... i will try to find out other solution.

**Norm** · 03-22-2012, 05:29 PM

Good luck. Be sure to come back and let us know what the problem was and how you solved it.

**anchitanc** · 03-26-2012, 01:50 PM

hi norm,

that problem has been resolved. by adding this statement in java.policy file

grant {
permission java.security.AllPermission;
};

and in my program i was using localhost in url and i started JBOSS as a run -b 0.0.0.0 (for access JBoss through ip address )

thanks
Anchit