A Codapella - coding at the purest form: 2009

Thursday, December 24, 2009

Server Tomcat v6.0 Server at localhost was unable to start within 45 seconds. What if the server requires more time?

Problem: Debugging a web app on Tomcat within Eclipse that takes more than 45 seconds to start-up, which prompts the following message:

Server Tomcat v6.0 Server at localhost was unable to start within 45 seconds. If the server requires more time, try increasing the timeout in the server editor.

Solution: I'm not sure where the server editor is located, but changing the start-timeout="45" in workspace\.metadata\.plugins\org.eclipse.wst.server.core\server.xml would help, make sure restart eclipse after the change.

Monday, August 31, 2009

VMWare connects at 10Mbps

Problem: After the weekend, my VMWare's XP(AMD PCNET Family PCI Ethernet Adapter) connects to the network at 10Mbps, while it was connecting at 1Gbps before the weekend.

Solution: Check the VMWare's MAC address, let your administrator know if the address has been updated. Secondly, reinstall/repair VMWare Tools.

Thursday, August 13, 2009

Disabling hotmail ads

Problem; Hotmail's ads on the side sometimes has the semi-porn like graphics, which isn't very appropriate at work, especially when the supervisor just walked by and thought the employee is surfing porn sites.

Solution: edit the \windows\system32\drivers\etc\hosts file, add the following lines(or whatever domains that host the ads)

127.0.0.1 ads1.live.com
127.0.0.1 rad.live.com
127.0.0.1 live.rads.live.com
127.0.0.1 ads1.msn.com
127.0.0.1 rad.msn.com
127.0.0.1 live.rads.msn.com
127.0.0.1 view.atdmt.com

Tuesday, July 28, 2009

Caused by: java.util.MissingResourceException: Can't find resource for bundle java.util.PropertyResourceBundle

Problem: keeps getting exception of a missing key from ResouceBundle

Caused by: java.util.MissingResourceException: Can't find resource for bundle java.util.PropertyResourceBundle, key low_battery_notification

Solution: Check the spelling and make sure the key is case-sensitive.
Turns out that low_battery_notification wasn't there, but low_Battery_notification was.

Monday, July 6, 2009

Nice Spring 3 MVC feature: Content Negotiation

Content Negotiation using Spring MVC's ContentNegotiatingViewResolver

Wednesday, June 17, 2009

OpenSymphony Quartz clustering issue

Problem:
Starting up another node causes the following warning:

Jun 17, 2009 10:56:10 AM org.quartz.impl.jdbcjobstore.JobStoreSupport findFailedInstances
WARNING: This scheduler instance (node-1) is still active but was recovered by another instance in the cluster. This may cause inconsistent behavior.

Jun 17, 2009 10:56:30 AM org.quartz.impl.jdbcjobstore.JobStoreSupport logWarnIfNonZero
INFO: ClusterManager: detected 1 failed or restarted instances.

Jun 17, 2009 10:56:30 AM org.quartz.impl.jdbcjobstore.JobStoreSupport clusterRecover
INFO: ClusterManager: Scanning for instance "node-2"'s failed in-progress jobs.

Jun 17, 2009 10:56:30 AM org.quartz.impl.jdbcjobstore.JobStoreSupport logWarnIfNonZero
INFO: ClusterManager: ......Freed 1 acquired trigger(s).

Solution: Synchronize the clock on both nodes

Thursday, June 4, 2009

JavaOne: Java Concurrency Gotchas by Alex Miller

http://puredanger.com/techfiles/JavaOne_ConcurrencyGotchas.pdf

Friday, May 29, 2009

JDE Plug-in for Eclipse Installation

1.) download Eclipse, http://www.eclipse.org/downloads/download.php?file=/technology/epp/downloads/release/ganymede/SR2/eclipse-java-ganymede-SR2-win32.zip

2.) download JDE Plug-in for Eclipse, http://na.blackberry.com/eng/developers/javaappdev/javaeclipseplug.jsp
2.1) click "Download the Full Installer"
2.2) fill out the form
2.3) download eJDE1.0.0.67_With_CP4.5.0.16.zip

3.) download JDE Compent Pack, http://na.blackberry.com/eng/developers/javaappdev/javaeclipseplug.jsp
3.1) click "Download the Eclipse Software Update for the BlackBerry JDE v4.7 Component Pack"
3.2) fill out the form
3.3) download eJDE-4_7_0_46_Component.zip

4.) extract eclipse-java-ganymede-SR2-win32.zip
4.1) start eclipse.exe
4.2) select a new workspace, i.e. c:\bb_workspace

5.) click Help->Software Update->Available Software

5.1) click "Manage Sites..."

6.) there could be several checkboxes already checked

6.1) uncheck all the checkbox

6.2) click "OK"

7.) it should prompt the screen with an empty software list

7.1) click "Add Site..."
7.2) click "Archive"
7.3) point to eJDE1.0.0.67_With_CP4.5.0.16.zip
7.4) click "Add Site..."
7.5) click "Archive"
7.6) point to eJDE-4_7_0_46_Component.zip

8.) shown:

8.1) check "BlackBerry JDE Plug-in for Eclipse"
8.2) uncheck "BlackBerry Component Pack 4.5.0"
8.3) check "BlackBerry Component Pack 4.7.0"

9.) shown:

9.1) click "Next"

10.) shown:

10.1) click "Finish"

11.) shown:

11.1) click "Yes"

Thursday, May 7, 2009

Loaded Nextel 8350i 4.6.1.204 on a Telus 8350i

Download 8350iAMEA_PBr4.6.1_rel316_PL3.0.0.73_A4.6.1.204.exe
from BlackBerry download for Nextel

make sure to remove the Vendor.xml at
C:\Program Files\Common Files\Research In Motion\AppLoader

Friday, March 13, 2009

InterruptedException, URISyntaxException: Illegal character in path ... at Axis2 Codegen Wizard

Problem: Such exception is thrown during code gen(under Windows).

Solution: move the wsdl file to a path without special character(i.e. Document and Settings, Program Files).

Thursday, March 12, 2009

java.lang.reflect.InvocationTargetException at Axis2 Codegen Wizard

Problem: java.lang.reflect.InvocationTargetException

1. An exception is thrown:

2. Identify the errors by
2.1 workspace/.metadata/.log OR
2.2 turn the console log on if there is no file at the above path by running "eclipse -consoleLog"

3. in my case, one of many exceptions is:
Caused by: java.lang.ClassNotFoundException: edu.emory.mathcs.backport.java.util.concurrent.ConcurrentHashMap
...
at java.lang.ClassLoader.loadClassInternal(Unknown Source)
... 60 more

4. Find the missing jars at Axis2_Codegen_Wizard_1.3.0\plugin.xml

5. Mines include:
backport-util-concurrent-3.1.jar
jibx-bind-1.1.5.jar
jibx-run-1.1.5.jar
neethi-2.0.4.jar

woden-1.0M8.jar can't be found anywhere, needs to download the interface and implementations separately and add them to the plugin.xml.

woden-api-1.0M8.jar
woden-impl-dom-1.0M8.jar
woden-impl-om-1.0M8.jar

6. run "eclipse -clean"

7. Voila!

Tuesday, March 10, 2009

A fatal error has occurred while upgrading your device's software. Device communications error encountered.

Problem:

Upgrading the handset OS with Desktop Manager via USB connection, and it crashed.

Then it became unusable: Reload software: 507

Solution(for my case): Don't run anything on the serial/communication ports while upgrading, seems like the RIM software wants to talk to these ports and because they are occupeid, it threw exception.

P.S.: It takes more than 20 minutes for my OS to reboot afterward, be patient!

Friday, February 27, 2009

HTTP Header Field: BlackBerry Browser VS Opera Mini

BlackBerry:


GET / HTTP/1.0
Host: (host ip:port)
User-Agent: BlackBerry8830/4.5.0.77 Profile/MIDP-2.0 Configuration/CLDC-1.1 VendorID/126
Accept: application/vnd.rim.html,text/html,application/xhtml+xml,application/vnd.wap.xhtml+xml,text/vnd.sun.j2me.app-descriptor,image/vnd.rim.png,image/jpeg,application/x-vnd.rim.pme.b,image/gif;anim=1,application/vnd.wap.wmlc;q=0.9,application/vnd.wap.wmlscriptc;q=0.7,text/vnd.wap.wml;q=0.7,*/*;q=0.5
Accept-Language: en-US,en;q=0.5
Accept-Charset: ISO-8859-1,UTF-8,US-ASCII,UTF-16BE,windows-1252,UTF-16LE,windows-1250
Connection: keep-alive
profile: http://www.blackberry.net/go/mobile/profiles/uaprof/8830/4.5.0.rdf
Via: BISB_3.4.0.45, 1.1 pmds67.bisb1.blackberry:3128 (squid/2.5.STABLE12)
Cache-Control: max-age=259200
x-wap-profile: "http://www.blackberry.net/go/mobile/profiles/uaprof/8830/4.5.0.rdf"
X-Forwarded-For: unknown

Opera Mini:


GET / HTTP/1.1
Host: (host ip:port)
User-Agent: Opera/9.60 (J2ME/MIDP; Opera Mini/4.2.13337/670; U; en) Presto/2.2.0
Accept: text/html, application/xml;q=0.9, application/xhtml+xml, image/png, image/jpeg, image/gif, image/x-xbitmap, */*;q=0.1
Accept-Language: en,en;q=0.9
Accept-Charset: iso-8859-1, utf-8, utf-16, *;q=0.1
Accept-Encoding: deflate, gzip, x-gzip, identity, *;q=0
Connection: Keep-Alive
X-OperaMini-Features: advanced, file_system, folding
X-OperaMini-Phone-UA: BlackBerry
X-OperaMini-Phone: RIM #
x-forwarded-for: (some ip)

Tuesday, February 17, 2009

Java Serial Port Communication(javacomm) in 4 steps

These steps apply to Windows environment only:
1.) download javacomm20-win32.zip
2.) extract comm.jar to ..\jre\lib\ext
3.) extract javax.comm.properties to ..\jre\lib folder
4.) extract win32comm.dll to c:\windows


import java.util.Enumeration;
import javax.comm.CommPortIdentifier;

public class JavaCommTest {
    public static void main(String[] ap) {
        Enumeration pList = CommPortIdentifier.getPortIdentifiers();

        while (pList.hasMoreElements()) {
            CommPortIdentifier cpi = (CommPortIdentifier) pList.nextElement();
            System.out.print("Port " + cpi.getName() + " ");
            if (cpi.getPortType() == CommPortIdentifier.PORT_SERIAL) {
                System.out.println("is a Serial Port: " + cpi);
            } else if (cpi.getPortType() == CommPortIdentifier.PORT_PARALLEL) {
                System.out.println("is a Parallel Port: " + cpi);
            } else {
                System.out.println("is an Unknown Port: " + cpi);
            }
        }
    }
}

Here are the outputs of the above snippet if missing:

win32comm.dll - Error loading win32com: java.lang.UnsatisfiedLinkError: no win32com in java.library.path

javax.comm.properties - pList would return false at hasMoreElements()

Friday, January 23, 2009

DeploymentException, ArrayIndexOutOfBoundsException, OutOfMemoryError casued by Parlay X with Axis2

Problem:Using Axis2 client to make a webservice call to Parlay X service, might cause the following exceptions, eventually OutOfMemoryError.


2009-01-15 07:32:18,947 ERROR [org.apache.axis2.deployment.ModuleDeployer]
The mex-1.4.jar module, which is not valid, caused null
org.apache.axis2.deployment.DeploymentException
at org.apache.axis2.deployment.repository.util.ArchiveReader.readModuleArchive(ArchiveReader.java:531)
at org.apache.axis2.deployment.ModuleDeployer.deploy(ModuleDeployer.java:71)
at org.apache.axis2.deployment.repository.util.DeploymentFileData.deploy(DeploymentFileData.java:136)
at org.apache.axis2.deployment.DeploymentEngine.doDeploy(DeploymentEngine.java:597)
at org.apache.axis2.deployment.RepositoryListener.loadClassPathModules(RepositoryListener.java:195)
at org.apache.axis2.deployment.RepositoryListener.init2(RepositoryListener.java:70)
at org.apache.axis2.deployment.RepositoryListener.(RepositoryListener.java:63)
at org.apache.axis2.deployment.DeploymentEngine.loadFromClassPath(DeploymentEngine.java:164)
at org.apache.axis2.deployment.FileSystemConfigurator.getAxisConfiguration(FileSystemConfigurator.java:135)
at org.apache.axis2.context.ConfigurationContextFactory.createConfigurationContext(ConfigurationContextFactory.java:68)
at org.apache.axis2.context.ConfigurationContextFactory.createConfigurationContextFromFileSystem(ConfigurationContextFactory.java:184)
at org.apache.axis2.client.ServiceClient.configureServiceClient(ServiceClient.java:150)
at org.apache.axis2.client.ServiceClient.(ServiceClient.java:143)
at org.csapi.www.wsdl.parlayx.terminal_location.v2_0.service.TerminalLocationServiceStub.(TerminalLocationServiceStub.java:139)
at org.csapi.www.wsdl.parlayx.terminal_location.v2_0.service.TerminalLocationServiceStub.(TerminalLocationServiceStub.java:125)
at org.csapi.www.wsdl.parlayx.terminal_location.v2_0.service.TerminalLocationServiceStub.(TerminalLocationServiceStub.java:173)
at org.csapi.www.wsdl.parlayx.terminal_location.v2_0.service.TerminalLocationServiceStub.(TerminalLocationServiceStub.java:165)
.
.
.
Caused by: org.apache.axiom.om.OMException
at org.apache.axiom.om.impl.builder.StAXOMBuilder.next(StAXOMBuilder.java:243)
at org.apache.axiom.om.impl.llom.OMDocumentImpl.getOMDocumentElement(OMDocumentImpl.java:132)
at org.apache.axiom.om.impl.builder.StAXOMBuilder.getDocumentElement(StAXOMBuilder.java:411)
at org.apache.axis2.util.XMLUtils.toOM(XMLUtils.java:602)
at org.apache.axis2.util.XMLUtils.toOM(XMLUtils.java:581)
at org.apache.axis2.deployment.DescriptionBuilder.buildOM(DescriptionBuilder.java:97)
at org.apache.axis2.deployment.ModuleBuilder.populateModule(ModuleBuilder.java:90)
at org.apache.axis2.deployment.repository.util.ArchiveReader.readModuleArchive(ArchiveReader.java:518)
... 26 more



2009-01-05 00:57:01,845 ERROR [org.apache.axis2.deployment.ModuleDeployer]
The mex-1.4.jar module, which is not valid, caused java.lang.ArrayIndexOutOfBoundsException: -1
org.apache.axis2.deployment.DeploymentException: java.lang.ArrayIndexOutOfBoundsException: -1
at org.apache.axis2.deployment.repository.util.ArchiveReader.readModuleArchive(ArchiveReader.java:531)
at org.apache.axis2.deployment.ModuleDeployer.deploy(ModuleDeployer.java:71)
at org.apache.axis2.deployment.repository.util.DeploymentFileData.deploy(DeploymentFileData.java:136)
at org.apache.axis2.deployment.DeploymentEngine.doDeploy(DeploymentEngine.java:597)
at org.apache.axis2.deployment.RepositoryListener.loadClassPathModules(RepositoryListener.java:195)
at org.apache.axis2.deployment.RepositoryListener.init2(RepositoryListener.java:70)
at org.apache.axis2.deployment.RepositoryListener.(RepositoryListener.java:63)
at org.apache.axis2.deployment.DeploymentEngine.loadFromClassPath(DeploymentEngine.java:164)
at org.apache.axis2.deployment.FileSystemConfigurator.getAxisConfiguration(FileSystemConfigurator.java:135)
at org.apache.axis2.context.ConfigurationContextFactory.createConfigurationContext(ConfigurationContextFactory.java:68)
at org.apache.axis2.context.ConfigurationContextFactory.createConfigurationContextFromFileSystem(ConfigurationContextFactory.java:184)
at org.apache.axis2.client.ServiceClient.configureServiceClient(ServiceClient.java:150)
at org.apache.axis2.client.ServiceClient.(ServiceClient.java:143)
at org.csapi.www.wsdl.parlayx.terminal_location.v2_0.service.TerminalLocationServiceStub.(TerminalLocationServiceStub.java:139)
at org.csapi.www.wsdl.parlayx.terminal_location.v2_0.service.TerminalLocationServiceStub.(TerminalLocationServiceStub.java:125)
at org.csapi.www.wsdl.parlayx.terminal_location.v2_0.service.TerminalLocationServiceStub.(TerminalLocationServiceStub.java:173)
at org.csapi.www.wsdl.parlayx.terminal_location.v2_0.service.TerminalLocationServiceStub.(TerminalLocationServiceStub.java:165)
.
.
.
Caused by: org.apache.axiom.om.OMException: java.lang.ArrayIndexOutOfBoundsException: -1
at org.apache.axiom.om.impl.builder.StAXOMBuilder.next(StAXOMBuilder.java:249)
at org.apache.axiom.om.impl.llom.OMDocumentImpl.getOMDocumentElement(OMDocumentImpl.java:132)
at org.apache.axiom.om.impl.builder.StAXOMBuilder.getDocumentElement(StAXOMBuilder.java:411)
at org.apache.axis2.util.XMLUtils.toOM(XMLUtils.java:602)
at org.apache.axis2.util.XMLUtils.toOM(XMLUtils.java:581)
at org.apache.axis2.deployment.DescriptionBuilder.buildOM(DescriptionBuilder.java:97)
at org.apache.axis2.deployment.ModuleBuilder.populateModule(ModuleBuilder.java:90)
at org.apache.axis2.deployment.repository.util.ArchiveReader.readModuleArchive(ArchiveReader.java:518)
... 26 more
Caused by: java.lang.ArrayIndexOutOfBoundsException: -1
at com.sun.xml.stream.xerces.util.NamespaceSupport.pushContext(NamespaceSupport.java:178)
at com.sun.xml.stream.XMLNSDocumentScannerImpl.scanStartElement(XMLNSDocumentScannerImpl.java:240)
at com.sun.xml.stream.XMLDocumentFragmentScannerImpl$FragmentContentDriver.next(XMLDocumentFragmentScannerImpl.java:2599)
at com.sun.xml.stream.XMLDocumentScannerImpl$PrologDriver.next(XMLDocumentScannerImpl.java:857)
at com.sun.xml.stream.XMLDocumentScannerImpl.next(XMLDocumentScannerImpl.java:330)
at com.sun.xml.stream.XMLReaderImpl.next(XMLReaderImpl.java:502)
at org.apache.axiom.om.impl.builder.StAXOMBuilder.parserNext(StAXOMBuilder.java:506)
at org.apache.axiom.om.impl.builder.StAXOMBuilder.next(StAXOMBuilder.java:161)
... 33 more

Solution:

Do not instantiate the object of the class that extends org.apache.axis2.client.Stub more than once per application, else it will keep loading the class mex-1.4.jar.

If it needs to be instantiated more than once, then make sure the instantiation method is synchronized. Beware that whenever the mex-1.4.jar is loaded, it will make a copy at the /tmp/ folder, make sure there is enough space to hold all those temp mex-1.4.jar

p.s. possibly related to this

http://issues.apache.org/jira/browse/AXIS2-1927

Friday, January 16, 2009

Axis2 connection retry setting

problem: Axis2 retries 3 times before giving up connection, and want to disable this retry feature.


- I/O exception (java.net.ConnectException) caught when processing request: Connection refused
- Retrying request
- I/O exception (java.net.ConnectException) caught when processing request: Connection refused
- Retrying request
- I/O exception (java.net.ConnectException) caught when processing request: Connection refused
- Retrying request
- Unable to sendViaPost to url[http://somehost.com:80/someservice]
java.net.ConnectException: Connection refused
at java.net.PlainSocketImpl.socketConnect(Native Method)
at java.net.PlainSocketImpl.doConnect(PlainSocketImpl.java:333)
at java.net.PlainSocketImpl.connectToAddress(PlainSocketImpl.java:195)
at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:182)
at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:366)
at java.net.Socket.connect(Socket.java:519)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.apache.commons.httpclient.protocol.ReflectionSocketFactory.createSocket(ReflectionSocketFactory.java:140)
at org.apache.commons.httpclient.protocol.DefaultProtocolSocketFactory.createSocket(DefaultProtocolSocketFactory.java:125)
at org.apache.commons.httpclient.HttpConnection.open(HttpConnection.java:707)
at org.apache.commons.httpclient.MultiThreadedHttpConnectionManager$HttpConnectionAdapter.open(MultiThreadedHttpConnectionManager.java:1361)
at org.apache.commons.httpclient.HttpMethodDirector.executeWithRetry(HttpMethodDirector.java:387)
at org.apache.commons.httpclient.HttpMethodDirector.executeMethod(HttpMethodDirector.java:171)
at org.apache.commons.httpclient.HttpClient.executeMethod(HttpClient.java:397)
at org.apache.commons.httpclient.HttpClient.executeMethod(HttpClient.java:346)
at org.apache.axis2.transport.http.AbstractHTTPSender.executeMethod(AbstractHTTPSender.java:542)
at org.apache.axis2.transport.http.HTTPSender.sendViaPost(HTTPSender.java:189)
at org.apache.axis2.transport.http.HTTPSender.send(HTTPSender.java:75)
at org.apache.axis2.transport.http.CommonsHTTPTransportSender.writeMessageWithCommons(CommonsHTTPTransportSender.java:364)
at org.apache.axis2.transport.http.CommonsHTTPTransportSender.invoke(CommonsHTTPTransportSender.java:208)
at org.apache.axis2.engine.AxisEngine.send(AxisEngine.java:448)
at org.apache.axis2.description.OutInAxisOperationClient.send(OutInAxisOperation.java:401)
at org.apache.axis2.description.OutInAxisOperationClient.executeImpl(OutInAxisOperation.java:228)
at org.apache.axis2.client.OperationClient.execute(OperationClient.java:163)
.
.
.
at java.lang.Thread.run(Thread.java:619)
Connection refused

solution: Customize a HttpClient that disable the retry for the Axis2 stub.


MultiThreadedHttpConnectionManager manager = new MultiThreadedHttpConnectionManager();
HttpMethodRetryHandler retry_handler = new DefaultHttpMethodRetryHandler(0, false);
HttpClientParams params = new HttpClientParams();
params.setParameter(HttpMethodParams.RETRY_HANDLER, retry_handler);
options.setProperty(HTTPConstants.CACHED_HTTP_CLIENT, new HttpClient(params, manager));
options.setProperty(HTTPConstants.REUSE_HTTP_CLIENT, true);

A Codapella - coding at the purest form