Hey Toby:
Thanks for your input.
Following is the stack trace for the other problem I was talking about.
Locally Janino compiles this without any issues, but it's throwing the
following exception when executed on the app-engine.
JaninoJavaAssessorHelper compile: THROW
java.security.AccessControlException: access denied
(java.lang.RuntimePermission accessDeclaredMembers)
at java.security.AccessControlContext.checkPermission(Unknown Source)
at java.security.AccessController.checkPermission(Unknown Source)
at java.lang.SecurityManager.checkPermission(Unknown Source)
at java.lang.SecurityManager.checkMemberAccess(Unknown Source)
at java.lang.Class.checkMemberAccess(Unknown Source)
at java.lang.Class.getDeclaredClasses(Unknown Source)
at
org.codehaus.janino.ReflectionIClass.getDeclaredIClasses2(ReflectionIClass.java:101)
at org.codehaus.janino.IClass.getDeclaredIClasses(IClass.java:252)
at org.codehaus.janino.IClass.findMemberType(IClass.java:617)
at org.codehaus.janino.IClass.findMemberType(IClass.java:634)
at org.codehaus.janino.IClass.findMemberType(IClass.java:604)
at
org.codehaus.janino.UnitCompiler.findMemberType(UnitCompiler.java:8011)
at org.codehaus.janino.UnitCompiler.getType2(UnitCompiler.java:4022)
at org.codehaus.janino.UnitCompiler.access$102(UnitCompiler.java:3990)
at
org.codehaus.janino.UnitCompiler$16.visitReferenceType(UnitCompiler.java:3936)
at org.codehaus.janino.Java$ReferenceType.accept(Java.java:1868)
at org.codehaus.janino.UnitCompiler.getType(UnitCompiler.java:3969)
at org.codehaus.janino.UnitCompiler.access$136(UnitCompiler.java:3927)
at
org.codehaus.janino.UnitCompiler$31.getParameterTypes(UnitCompiler.java:6674)
at org.codehaus.janino.IClass$IMethod.getDescriptor(IClass.java:762)
at org.codehaus.janino.IClass.getIMethods(IClass.java:180)
at org.codehaus.janino.IClass.getIMethods(IClass.java:169)
at org.codehaus.janino.UnitCompiler.compile2(UnitCompiler.java:328)
at org.codehaus.janino.UnitCompiler.compile2(UnitCompiler.java:313)
at
org.codehaus.janino.UnitCompiler$3.visitPackageMemberClassDeclaration(UnitCompiler.java:286)
at
org.codehaus.janino.Java$PackageMemberClassDeclaration.accept(Java.java:701)
at org.codehaus.janino.UnitCompiler.compile(UnitCompiler.java:292)
at org.codehaus.janino.UnitCompiler.compileUnit(UnitCompiler.java:270)
at
org.codehaus.janino.SimpleCompiler.compileToClassLoader(SimpleCompiler.java:423)
at org.codehaus.janino.SimpleCompiler.cook(SimpleCompiler.java:231)
at org.codehaus.janino.Cookable.cook(Cookable.java:72)
at org.codehaus.janino.Cookable.cook(Cookable.java:64)
at org.codehaus.janino.Cookable.cook(Cookable.java:114)
at
com.albertattard.askme.server.utils.JaninoJavaAssessorHelper.compile(JaninoJavaAssessorHelper.java:30)
at
com.albertattard.askme.server.BuilderServiceImpl.validateAssessor(BuilderServiceImpl.java:40)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at
com.google.apphosting.runtime.security.shared.intercept.java.lang.reflect.Method_$3.run(Method_.java:149)
at java.security.AccessController.doPrivileged(Native Method)
at
com.google.apphosting.runtime.security.shared.intercept.java.lang.reflect.Method_.privilegedInvoke(Method_.java:147)
at
com.google.apphosting.runtime.security.shared.intercept.java.lang.reflect.Method_.invoke(Method_.java:120)
at
com.google.gwt.user.server.rpc.RPC.invokeAndEncodeResponse(RPC.java:527)
at
com.google.gwt.user.server.rpc.RemoteServiceServlet.processCall(RemoteServiceServlet.java:166)
at
com.google.gwt.user.server.rpc.RemoteServiceServlet.doPost(RemoteServiceServlet.java:86)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:713)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:806)
at
org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:487)
at
org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1093)
at
com.google.apphosting.runtime.jetty.SaveSessionFilter.doFilter(SaveSessionFilter.java:35)
at
org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1084)
at
com.google.apphosting.utils.servlet.TransactionCleanupFilter.doFilter(TransactionCleanupFilter.java:43)
at
org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1084)
at
org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:360)
at
org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
at
org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:181)
at
org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:712)
at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:405)
at
com.google.apphosting.runtime.jetty.AppVersionHandlerMap.handle(AppVersionHandlerMap.java:237)
at
org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:139)
at org.mortbay.jetty.Server.handle(Server.java:313)
at
org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:506)
at
org.mortbay.jetty.HttpConnection$RequestHandler.headerComplete(HttpConnection.java:830)
at
com.google.apphosting.runtime.jetty.RpcRequestParser.parseAvailable(RpcRequestParser.java:76)
at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:381)
at
com.google.apphosting.runtime.jetty.JettyServletEngineAdapter.serviceRequest(JettyServletEngineAdapter.java:139)
at
com.google.apphosting.runtime.JavaRuntime.handleRequest(JavaRuntime.java:235)
at
com.google.apphosting.base.RuntimePb$EvaluationRuntime$6.handleBlockingRequest(RuntimePb.java:4823)
at
com.google.apphosting.base.RuntimePb$EvaluationRuntime$6.handleBlockingRequest(RuntimePb.java:4821)
at
com.google.net.rpc.impl.BlockingApplicationHandler.handleRequest(BlockingApplicationHandler.java:24)
at com.google.net.rpc.impl.RpcUtil.runRpcInApplication(RpcUtil.java:359)
at com.google.net.rpc.impl.Server$2.run(Server.java:820)
at
com.google.tracing.LocalTraceSpanRunnable.run(LocalTraceSpanRunnable.java:56)
at
com.google.tracing.LocalTraceSpanBuilder.internalContinueSpan(LocalTraceSpanBuilder.java:516)
at com.google.net.rpc.impl.Server.startRpc(Server.java:775)
at com.google.net.rpc.impl.Server.processRequest(Server.java:348)
at
com.google.net.rpc.impl.ServerConnection.messageReceived(ServerConnection.java:436)
at
com.google.net.rpc.impl.RpcConnection.parseMessages(RpcConnection.java:319)
at
com.google.net.rpc.impl.RpcConnection.dataReceived(RpcConnection.java:290)
at com.google.net.async.Connection.handleReadEvent(Connection.java:428)
at
com.google.net.async.EventDispatcher.processNetworkEvents(EventDispatcher.java:762)
at
com.google.net.async.EventDispatcher.internalLoop(EventDispatcher.java:207)
at com.google.net.async.EventDispatcher.loop(EventDispatcher.java:101)
at
com.google.net.rpc.RpcService.runUntilServerShutdown(RpcService.java:251)
at
com.google.apphosting.runtime.JavaRuntime$RpcRunnable.run(JavaRuntime.java:374)
at java.lang.Thread.run(Unknown Source)
Cheers,
Albert Attard
Ogden Nash <http://www.brainyquote.com/quotes/authors/o/ogden_nash.html> -
"The trouble with a kitten is that when it grows up, it's always a cat."
2009/8/27 Toby Reyelts <[email protected]>
> Logger.throwing logs at Level.FINER. Do you have your logging configured to
> log at that level (or more fine)?
>
>
> On Thu, Aug 27, 2009 at 2:20 PM, Albert Attard <[email protected]>wrote:
>
>> Hey Toby:
>> I'm having some trouble with the logging functionality. I'm logging my
>> exceptions but nothing is showing on the logs. Following a simple class
>> which uses logging.
>>
>> private static final Logger log =
>> Logger.getLogger(MyClass.class.getName());
>>
>> ...
>> }catch(Exception e)
>> log.throwing("MyClass", "MyMethod", e);
>> }
>>
>> Am I missing something?
>>
>> Regards,
>> Albert Attard
>>
>> Pablo
>> Picasso<http://www.brainyquote.com/quotes/authors/p/pablo_picasso.html> -
>> "Computers are useless. They can only give you answers."
>>
>> 2009/8/26 Toby Reyelts <[email protected]>
>>
>>> Can you provide the full stacktrace for the exception?
>>>
>>>
>>> On Wed, Aug 26, 2009 at 2:58 PM, Albert Attard
>>> <[email protected]>wrote:
>>>
>>>> Hey Toby:
>>>> Did as you instructed and worked. Thanks a lot Toby. Let me know should
>>>> you need anything. I'm glad to help.
>>>>
>>>>
>>>> Another question about Janino: I'm getting the following exception on
>>>> the live app-engine when the dynamic code (the code that is compiled by
>>>> janino) has a compilation error:
>>>>
>>>> An error occurred: java.security.AccessControlException: access denied
>>>> (java.lang.RuntimePermissions accessDeclaredMembers)
>>>>
>>>>
>>>> On the local environment, janino returns the line number where the error
>>>> occurred, which is very helpful for the students.
>>>>
>>>> Cheers,
>>>> Albert Attard
>>>>
>>>> Samuel
>>>> Goldwyn<http://www.brainyquote.com/quotes/authors/s/samuel_goldwyn.html> -
>>>> "I'm willing to admit that I may not always be right, but I am never
>>>> wrong."
>>>>
>>>> 2009/8/26 Toby Reyelts <[email protected]>
>>>>
>>>>
>>>>> Hey Albert,
>>>>>
>>>>> Even though I haven't actually seen the changes that you made, I
>>>>> believe they were unnecessary. (Go out on a limb with me here). I tracked
>>>>> the fault down to an error in our runtime that can be worked around by
>>>>> just
>>>>> recompiling the code. You should be able to confirm this on your end by
>>>>> recompiling Janino from source *without* any of the changes you made.
>>>>> Please make sure you've set the target version to 1.5 or 1.6.
>>>>>
>>>>> On Wed, Aug 26, 2009 at 4:51 AM, Albert Attard <[email protected]
>>>>> > wrote:
>>>>>
>>>>>> Hey Toby:
>>>>>> Janino api include classes that are not supported by the app-engine.
>>>>>> All I did is commented out the code that the app-engine didn't like in
>>>>>> janino and repackaged it.
>>>>>>
>>>>>> I did the following:
>>>>>>
>>>>>> - Downloaded the source for janino:
>>>>>> http://www.janino.net/download/janino-2.5.15.zip
>>>>>> - I've created a new Google Web Project in Eclipse
>>>>>> - I've copied the source into the Google Web Project
>>>>>> - Than I've *unsafely* commented out code that was not supported
>>>>>> by the Google app-engine
>>>>>> - Repackaged the edited code into a new jar and deployed it with
>>>>>> my project instead of the original one
>>>>>> - The simple proof of concept seams to work
>>>>>>
>>>>>> As you can see at the simple demo: http://ask-me.appspot.com/ the
>>>>>> code seams to work. Hope you manage to complete this question :)
>>>>>>
>>>>>> Cheers,
>>>>>> Albert Attard
>>>>>>
>>>>>> Stephen
>>>>>> Leacock<http://www.brainyquote.com/quotes/authors/s/stephen_leacock.html>
>>>>>> - "I detest life-insurance agents: they always argue that I shall some
>>>>>> day
>>>>>> die, which is not so."
>>>>>>
>>>>>> 2009/8/25 Toby Reyelts <[email protected]>
>>>>>>
>>>>>> Hey Albert,
>>>>>>>
>>>>>>> That code should actually work ok, but you've managed to tickle a bug
>>>>>>> in our runtime. I've filed an
>>>>>>> issue<http://code.google.com/p/googleappengine/issues/detail?id=2028>for
>>>>>>> you here. The fix for this probably won't make the next release, but it
>>>>>>> should come shortly thereafter.
>>>>>>>
>>>>>>>
>>>>>>> On Tue, Aug 25, 2009 at 6:33 AM, Albert Attard <
>>>>>>> [email protected]> wrote:
>>>>>>>
>>>>>>>> Hi Toby:
>>>>>>>> Thanks for you feedback.
>>>>>>>>
>>>>>>>> I've did a small prototype: http://ask-me.appspot.com/ . It's
>>>>>>>> working fine locally, but it's throwing the following exception when
>>>>>>>> executed on the app-engine:
>>>>>>>>
>>>>>>>> javax.servlet.ServletContext log: Exception while dispatching
>>>>>>>> incoming RPC call
>>>>>>>> com.google.gwt.user.server.rpc.UnexpectedException: Service method
>>>>>>>> 'public abstract com.albertattard.askme.client.utils.AssessmentTO
>>>>>>>> com.albertattard.askme.client.AssessorService.assessCode(java.lang.String)'
>>>>>>>> threw an unexpected exception: java.lang.VerifyError: (class:
>>>>>>>> org/codehaus/janino/ByteArrayClassLoader, method: findClass signature:
>>>>>>>> (Ljava/lang/String;)Ljava/lang/Class;) Illegal type in constant pool
>>>>>>>> at
>>>>>>>> com.google.gwt.user.server.rpc.RPC.encodeResponseForFailure(RPC.java:360)
>>>>>>>> at
>>>>>>>> com.google.gwt.user.server.rpc.RPC.invokeAndEncodeResponse(RPC.java:546)
>>>>>>>> at
>>>>>>>> com.google.gwt.user.server.rpc.RemoteServiceServlet.processCall(RemoteServiceServlet.java:166)
>>>>>>>> at
>>>>>>>> com.google.gwt.user.server.rpc.RemoteServiceServlet.doPost(RemoteServiceServlet.java:86)
>>>>>>>> at javax.servlet.http.HttpServlet.service(HttpServlet.java:713)
>>>>>>>> at javax.servlet.http.HttpServlet.service(HttpServlet.java:806)
>>>>>>>> at
>>>>>>>> org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:487)
>>>>>>>> at
>>>>>>>> org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1093)
>>>>>>>> at
>>>>>>>> com.google.apphosting.runtime.jetty.SaveSessionFilter.doFilter(SaveSessionFilter.java:35)
>>>>>>>> at
>>>>>>>> org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1084)
>>>>>>>> at
>>>>>>>> com.google.apphosting.utils.servlet.TransactionCleanupFilter.doFilter(TransactionCleanupFilter.java:43)
>>>>>>>> at
>>>>>>>> org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1084)
>>>>>>>> at
>>>>>>>> org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:360)
>>>>>>>> at
>>>>>>>> org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
>>>>>>>> at
>>>>>>>> org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:181)
>>>>>>>> at
>>>>>>>> org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:712)
>>>>>>>> at
>>>>>>>> org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:405)
>>>>>>>> at
>>>>>>>> com.google.apphosting.runtime.jetty.AppVersionHandlerMap.handle(AppVersionHandlerMap.java:237)
>>>>>>>> at
>>>>>>>> org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:139)
>>>>>>>> at org.mortbay.jetty.Server.handle(Server.java:313)
>>>>>>>> at
>>>>>>>> org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:506)
>>>>>>>> at
>>>>>>>> org.mortbay.jetty.HttpConnection$RequestHandler.headerComplete(HttpConnection.java:830)
>>>>>>>> at
>>>>>>>> com.google.apphosting.runtime.jetty.RpcRequestParser.parseAvailable(RpcRequestParser.java:76)
>>>>>>>> at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:381)
>>>>>>>> at
>>>>>>>> com.google.apphosting.runtime.jetty.JettyServletEngineAdapter.serviceRequest(JettyServletEngineAdapter.java:139)
>>>>>>>> at
>>>>>>>> com.google.apphosting.runtime.JavaRuntime.handleRequest(JavaRuntime.java:235)
>>>>>>>> at
>>>>>>>> com.google.apphosting.base.RuntimePb$EvaluationRuntime$6.handleBlockingRequest(RuntimePb.java:4823)
>>>>>>>> at
>>>>>>>> com.google.apphosting.base.RuntimePb$EvaluationRuntime$6.handleBlockingRequest(RuntimePb.java:4821)
>>>>>>>> at
>>>>>>>> com.google.net.rpc.impl.BlockingApplicationHandler.handleRequest(BlockingApplicationHandler.java:24)
>>>>>>>> at
>>>>>>>> com.google.net.rpc.impl.RpcUtil.runRpcInApplication(RpcUtil.java:359)
>>>>>>>> at com.google.net.rpc.impl.Server$2.run(Server.java:820)
>>>>>>>> at
>>>>>>>> com.google.tracing.LocalTraceSpanRunnable.run(LocalTraceSpanRunnable.java:56)
>>>>>>>> at
>>>>>>>> com.google.tracing.LocalTraceSpanBuilder.internalContinueSpan(LocalTraceSpanBuilder.java:516)
>>>>>>>> at com.google.net.rpc.impl.Server.startRpc(Server.java:775)
>>>>>>>> at com.google.net.rpc.impl.Server.processRequest(Server.java:348)
>>>>>>>> at
>>>>>>>> com.google.net.rpc.impl.ServerConnection.messageReceived(ServerConnection.java:436)
>>>>>>>> at
>>>>>>>> com.google.net.rpc.impl.RpcConnection.parseMessages(RpcConnection.java:319)
>>>>>>>> at
>>>>>>>> com.google.net.rpc.impl.RpcConnection.dataReceived(RpcConnection.java:290)
>>>>>>>> at
>>>>>>>> com.google.net.async.Connection.handleReadEvent(Connection.java:428)
>>>>>>>> at
>>>>>>>> com.google.net.async.EventDispatcher.processNetworkEvents(EventDispatcher.java:762)
>>>>>>>> at
>>>>>>>> com.google.net.async.EventDispatcher.internalLoop(EventDispatcher.java:207)
>>>>>>>> at
>>>>>>>> com.google.net.async.EventDispatcher.loop(EventDispatcher.java:101)
>>>>>>>> at
>>>>>>>> com.google.net.rpc.RpcService.runUntilServerShutdown(RpcService.java:251)
>>>>>>>> at
>>>>>>>> com.google.apphosting.runtime.JavaRuntime$RpcRunnable.run(JavaRuntime.java:374)
>>>>>>>> at java.lang.Thread.run(Unknown Source)
>>>>>>>> Caused by: java.lang.VerifyError: (class:
>>>>>>>> org/codehaus/janino/ByteArrayClassLoader, method: findClass signature:
>>>>>>>> (Ljava/lang/String;)Ljava/lang/Class;) Illegal type in constant pool
>>>>>>>> at
>>>>>>>> org.codehaus.janino.SimpleCompiler.compileToClassLoader(SimpleCompiler.java)
>>>>>>>> at org.codehaus.janino.SimpleCompiler.cook(SimpleCompiler.java)
>>>>>>>> at org.codehaus.janino.Cookable.cook(Cookable.java)
>>>>>>>> at org.codehaus.janino.Cookable.cook(Cookable.java)
>>>>>>>> at org.codehaus.janino.Cookable.cook(Cookable.java)
>>>>>>>> at
>>>>>>>> com.albertattard.askme.server.DemoSwapAssessor.assess(DemoSwapAssessor.java:21)
>>>>>>>> at
>>>>>>>> com.albertattard.askme.server.AssessorServiceImpl.assessCode(AssessorServiceImpl.java:15)
>>>>>>>> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
>>>>>>>> at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
>>>>>>>> at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
>>>>>>>> at java.lang.reflect.Method.invoke(Unknown Source)
>>>>>>>> at
>>>>>>>> com.google.apphosting.runtime.security.shared.intercept.java.lang.reflect.Method_$3.run(Method_.java:149)
>>>>>>>> at java.security.AccessController.doPrivileged(Native Method)
>>>>>>>> at
>>>>>>>> com.google.apphosting.runtime.security.shared.intercept.java.lang.reflect.Method_.privilegedInvoke(Method_.java:147)
>>>>>>>> at
>>>>>>>> com.google.apphosting.runtime.security.shared.intercept.java.lang.reflect.Method_.invoke(Method_.java:120)
>>>>>>>> at
>>>>>>>> com.google.gwt.user.server.rpc.RPC.invokeAndEncodeResponse(RPC.java:527)
>>>>>>>> ... 43 more
>>>>>>>>
>>>>>>>>
>>>>>>>> The janino ByteArrayClassLoader is not working well (not accepted)
>>>>>>>> on the app-engine :(
>>>>>>>>
>>>>>>>> Any other options?
>>>>>>>>
>>>>>>>> Cheers,
>>>>>>>> Albert Attard
>>>>>>>>
>>>>>>>> Marie von
>>>>>>>> Ebner-Eschenbach<http://www.brainyquote.com/quotes/authors/m/marie_von_ebnereschenbac.html>
>>>>>>>> - "Even a stopped clock is right twice a day."
>>>>>>>>
>>>>>>>> 2009/8/14 Toby Reyelts <[email protected]>
>>>>>>>>
>>>>>>>>
>>>>>>>>> We don't have any near term plans to whitelist javax.tools. Do you
>>>>>>>>> think something like janino <http://www.janino.net/> might work
>>>>>>>>> for you?
>>>>>>>>>
>>>>>>>>>
>>>>>>>>> On Fri, Aug 14, 2009 at 2:50 AM, Albert Attard <
>>>>>>>>> [email protected]> wrote:
>>>>>>>>>
>>>>>>>>>> Hi everyone:
>>>>>>>>>>
>>>>>>>>>> Background about the problem:
>>>>>>>>>> I'm a Java lecturer and would like to create an automated question
>>>>>>>>>> web application similar to a multiple choice questions and answers
>>>>>>>>>> but where
>>>>>>>>>> the students can practice coding instead of simply selecting an
>>>>>>>>>> answer.
>>>>>>>>>>
>>>>>>>>>> Multiple choice questions are very popular in web exams as these
>>>>>>>>>> are fully automated. You do the test and the system corrects it for
>>>>>>>>>> you and
>>>>>>>>>> gives you the results there and then. I would like to go one step
>>>>>>>>>> further
>>>>>>>>>> and have the student to supply a code fragment or even a class(es)
>>>>>>>>>> and have
>>>>>>>>>> the system automatically correcting it in a similar fashion to the
>>>>>>>>>> multiple
>>>>>>>>>> choice questions.
>>>>>>>>>>
>>>>>>>>>> Example (in a nutshell):
>>>>>>>>>> The student is asked to write a method: that given an array of int
>>>>>>>>>> and two indices of type int (between 0 and the size of the array -
>>>>>>>>>> 1), this
>>>>>>>>>> method will swap the elements at the given indices. The student
>>>>>>>>>> will write the method in the provided text area and submit it.
>>>>>>>>>> Then the system will include this method into a class, compile it
>>>>>>>>>> and by
>>>>>>>>>> using reflection executes it with an array of values (similar to
>>>>>>>>>> JUnit) to
>>>>>>>>>> ensure that it is working as expected. During this process the
>>>>>>>>>> system will
>>>>>>>>>> be awarding the student marks and will display the final result
>>>>>>>>>> together
>>>>>>>>>> with comments as required.
>>>>>>>>>>
>>>>>>>>>> Google Appengine
>>>>>>>>>> I have a prototype and it works great on Tomcat. Yes I know that
>>>>>>>>>> it is subject to Java code injection but that's not an issue at this
>>>>>>>>>> stage. This issue can be fixed at a later stage. Unfortunately I
>>>>>>>>>> cannot
>>>>>>>>>> implement it on the Google Appengine as most of the
>>>>>>>>>> required functionality, such as writing to a file or JavaCompiler is
>>>>>>>>>> disabled . I've managed to compile the classes to database (without
>>>>>>>>>> writing
>>>>>>>>>> to the file system) and load classes from database (without reading
>>>>>>>>>> from the
>>>>>>>>>> file system), which can integrate well with the provided datastore.
>>>>>>>>>> Is there a way (or a procedure) of implementing such a system on
>>>>>>>>>> the Google Appengine? This application will be a free education tool
>>>>>>>>>> for everyone who would like to use it.
>>>>>>>>>>
>>>>>>>>>> Thanks in advance,
>>>>>>>>>> Albert Attard
>>>>>>>>>>
>>>>>>>>>> Ted
>>>>>>>>>> Turner<http://www.brainyquote.com/quotes/authors/t/ted_turner.html>
>>>>>>>>>> - "Sports is like a war without the killing."
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>
>>>>>
>>>>>
>>>>
>>>>
>>>>
>>>
>>>
>>>
>>
>>
>>
>
> >
>
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