Error: unsupported encoding Cp037 for result set column SQLState: 22021 ErrorCode: -99999

Cause:
Issue with JVM version installed on your machine. Mostly occurs because of multiple versions of java in the OS or when international version of jdk/jre is not installed. It is related to carsets.jar

Solution:
Delete the java.exe from C:\Windows\system32 (make a copy first)
Make sure that JAVA_HOME is set correctly and JAVA_HOME/bin is added to PATH & CLASSPATH.

Note: Uninstall/Delete old version’s on JDK/JRE from you machine and make a fresh installation.

Reason: Cannot read project model from interpolating filter of serialized version. for project com.
main at C:\dev&test\

[INFO] ————————————————————————
[INFO] Trace
org.apache.maven.reactor.MavenExecutionException: Cannot read project model from interpolating filter of serialized vers
ion. for project com.dev.project at
at org.apache.maven.DefaultMaven.getProjects(DefaultMaven.java:378)
at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:292)
at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:129)
at org.apache.maven.cli.MavenCli.main(MavenCli.java:287)
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:585)
at org.codehaus.classworlds.Launcher.launchEnhanced(Launcher.java:315)
at org.codehaus.classworlds.Launcher.launch(Launcher.java:255)
at org.codehaus.classworlds.Launcher.mainWithExitCode(Launcher.java:430)
at org.codehaus.classworlds.Launcher.main(Launcher.java:375)
Caused by: org.apache.maven.project.InvalidProjectModelException: Cannot read project model from interpolating filter of
serialized version. for project com.dev.project at
at org.apache.maven.project.DefaultMavenProjectBuilder.buildInternal(DefaultMavenProjectBuilder.java:882)
at org.apache.maven.project.DefaultMavenProjectBuilder.buildFromSourceFileInternal(DefaultMavenProjectBuilder.ja
va:506)
at org.apache.maven.project.DefaultMavenProjectBuilder.build(DefaultMavenProjectBuilder.java:198)
at org.apache.maven.DefaultMaven.getProject(DefaultMaven.java:583)
at org.apache.maven.DefaultMaven.collectProjects(DefaultMaven.java:461)
at org.apache.maven.DefaultMaven.collectProjects(DefaultMaven.java:534)
at org.apache.maven.DefaultMaven.getProjects(DefaultMaven.java:365)
… 11 more
Caused by: org.apache.maven.project.interpolation.ModelInterpolationException: Cannot read project model from interpolat
ing filter of serialized version.
at org.apache.maven.project.interpolation.RegexBasedModelInterpolator.interpolate(RegexBasedModelInterpolator.ja
va:114)
at org.apache.maven.project.DefaultMavenProjectBuilder.processProjectLogic(DefaultMavenProjectBuilder.java:1016)

at org.apache.maven.project.DefaultMavenProjectBuilder.buildInternal(DefaultMavenProjectBuilder.java:878)
… 17 more
Caused by: org.codehaus.plexus.util.xml.pull.XmlPullParserException: entity reference name can not contain character \’
(position: START_TAG seen …C:\dev&test\… @314:33)
at org.codehaus.plexus.util.xml.pull.MXParser.parseEntityRef(MXParser.java:2222)
at org.codehaus.plexus.util.xml.pull.MXParser.nextImpl(MXParser.java:1275)
at org.codehaus.plexus.util.xml.pull.MXParser.next(MXParser.java:1093)
at hidden.org.codehaus.plexus.util.xml.Xpp3DomBuilder.build(Xpp3DomBuilder.java:187)
at hidden.org.codehaus.plexus.util.xml.Xpp3DomBuilder.build(Xpp3DomBuilder.java:94)
at org.apache.maven.model.io.xpp3.MavenXpp3Reader.parsePluginExecution(MavenXpp3Reader.java:3144)
at org.apache.maven.model.io.xpp3.MavenXpp3Reader.parsePlugin(MavenXpp3Reader.java:2901)
at org.apache.maven.model.io.xpp3.MavenXpp3Reader.parseBuild(MavenXpp3Reader.java:753)
at org.apache.maven.model.io.xpp3.MavenXpp3Reader.parseModel(MavenXpp3Reader.java:2224)
at org.apache.maven.model.io.xpp3.MavenXpp3Reader.read(MavenXpp3Reader.java:4422)
at org.apache.maven.model.io.xpp3.MavenXpp3Reader.read(MavenXpp3Reader.java:4433)
at org.apache.maven.project.interpolation.RegexBasedModelInterpolator.interpolate(RegexBasedModelInterpolator.ja
va:105)
… 19 more

Cause:
This is a standard error while making build in maven on Windows.
It occurs when your path contain’s special characters like ‘&’, ” etc.
Remove ampersand from the path and this should solve the problem. This is because mvn.bat cannot handle these characters in windows.

Solution: Remove ampersand “&” or special characters from path or username

Example:
Path: D:\workspace\dev&test\project1\mvn clean install (Error)
Rename the folder dev&test to devtest

Hope this Helps !

A Web Application generally has three servers; Web, Application and Database. Your first request hits the Web Server which will handle the SSL authentication and forward request to the App Server which will process the request and send the response back through the same route.

Web Application Server Layers

… to be added

Solution:
This happens beacuse here ESCAPE sequence ( \) does not work with single quote ( ‘ ).
You can achieve this by prefixing the single quote which you intent to insert by an additional single quote (‘).
i.e: Add two single quotes (”) where ever you have to insert/update one single quote (‘)

Example:
Query with Error:

INSERT INTO TABLENAME VALUES (1, ‘ D’Souza ‘, ‘Active ‘, CURRENT TIMESTAMP);

Use below Query :

INSERT INTO TABLENAME VALUES (1, ‘ D”Souza ‘, ‘Active ‘, CURRENT TIMESTAMP);

The same holds true with update statements.
Do comment if you have nquestions.

Download File:

getSystemProperties

Step1: Download the Resource Hacker tool from here.

Step2: Unzip the folder and execute the file “ResHacker.exe”. This open a window, Go to File > Open and browse to the Path of your “MySQLInstanceConfig.exe” file inside “<Drive>:\MySQL\MySQL Server 5.1\MySQLInstanceConfig.exe”. This will load an assembly file, on your left navigational tree section click on folder 24 > 1 > 1003. This opens an XML configuration file.

Step3: Edit this file by changing the privilege “asAdministrator” to “requireAdministrator”.  Click button on the top of window which states “Compile Script”. Now go to File > Save as.  Save the File with name “MySQLInstanceConfig.exe” on the desktop.

Close the Resource Hacker tool, copy the “MySQLInstanceConfig.exe” file from desktop and overwrite it on the exisiting file in “<Drive>:\MySQL\MySQL Server 5.1\bin” folder.

Double click on the exe and the instance installation will begin.

References:

• http://www.weeklyworldwhatever.com/2008/02/21/cant-install-mysql-5051a-because-its-side-by-side-configuration-is-incorrect/#comment-50
• MySQL 5.1 Vista Bug

Downloads:

• Download MySQL from here.
• Check Windows Vista here.

Step1: Donwload/Install Apache

• Download Apache HTTP Server from here. Get the apache_2.2.11-win32-x86-openssl-0.9.8i.msi installer and install the Apache Server.
• Open the conf/httpd.conf file and check if the line “LoadModule ssl_module modules/mod_ssl.so” is commented or not. If commented then uncomment the line and check if the file “mod_ssl.so” is available in the ‘modules’ folder, if not then you have downloaded the non ssl version of Apache please download the apache with openssl version and install it.
• Create a file named “ssl.conf” in the ‘conf’ folder which will hold all the ssl related configurations.Add the following line to “httpd.conf” file. <IfModule mod_ssl.c>
  Include conf/ssl.conf
  </IfModule>

Step2: Add SSL Certificate

• The second step is to add the SSL certifcate to the SSL configuration file, the certificate can be either self created or we can get them from Certifcate Authority, getting this from Trusted Certificate Authority is a better idea since this will not display warning to the users who connect to your application. Self signed SSL certificate can be used for demonstration purpose for small applications or in an intranet environment.
• Go to the ‘bin’ folder of the Apache and check if you have “openssl.exe” binary there, we will use this tool to create the self signed certificate.
• Download the “openssl.conf” file from here and place it in the ‘bin’ folder.(rename the opensslcnf.doc to openssl.cnf once downloaded)
• Go to the command prompt where the have “openssl.exe” file.
  Run the following command to create a new certificate request:
  prompt>openssl req -config openssl.cnf -new -out mycert.csr -keyout mycert.pem
  You’ll be prompted to fill answers to many questions. Remember your PEM pass phrase which you have entered. Now we need to create a nonpassword protected key for Apache 2 by running the following command:
  prompt>openssl rsa -in mycert.pem -out mycert.key
  This will create a key file as earlier but one without password protection.To create this file just enter your pass phrase given earlier.
  Lastly we need to create the X.509 public certificate.
  Run the following command:
  prompt>openssl x509 -in mycert.csr -out mycert.cert -req -signkey mycert.key -days 365
  This create the self signed certificate which expires after 365 days.

Step3: Configure the “ssl.conf” file.

• Create a folder ‘ssl’ under ‘conf’ folder to keep your SSL key and certificate files. Add the two files created in the previous step “mycert.key” and “mycert.cert” file inside this folder.
• Open “ssl.conf” file and change the line DocumentRoot, ServerName and ServerAdmin as per your http.conf file. (Note: Its recommended to keep the SSL port as 443 since many firewalls block SSL on other ports).
• Now change the lines SSLCertificateFile and  SSLCertificateKey to path where the key and cert files in ‘ssl’ folder are kept. SSLCertificateFile conf/ssl/mycert.cert
  #SSLCertificateFile conf/ssl/server-dsa.crt#   Server Private Key:
  #   If the key is not combined with the certificate, use this
  #   directive to point at the key file.  Keep in mind that if
  #   you’ve both a RSA and a DSA private key you can configure
  #   both in parallel (to also allow the use of DSA ciphers, etc.)
  SSLCertificateKeyFile conf/ssl/mycert.key
  #SSLCertificateKeyFile conf/ssl.key/server-dsa.key
• That’s all, just save the changes & restart the Apache Server.
• Open “https://localhost/” to test SSL.

(Note: We have assumed that Apache is running on port 80 and SSL on port 443 you can configure for any other port)

If you already have the Certificate’s provided to you from Certificate Authority just skip step two and put these certificates inside the ‘ssl’ folder and add there respective path in the “ssl.conf” file.

You just got your Apache SSL enabled.

WARNING: Parameters: Character decoding failed. Parameter skipped.
java.io.CharConversionException: isHexDigit

Cause:

• Generally we get this error when we try to add special characters like “%, @, $ .. etc” in the GET/POST request from Ajax Call.
• Since these characters are used to URL specific function like “&” id used to differentiate various URL parameters. This generates a “null” value for the parameter you will try to retrieve in Servlet.

Solution:

The simple way to get over this problem is to massage your Special Character String with “escape()” funtion in javascript.

Example:

Before:

var vUserEnteredData = document.formname.textbox.value ;  //  textbox = 100%

var parameters = “testId=A101&percentageNeeded=” + vUserEnteredData;

// Some Ajax Code …..

request.setRequestHeader( ‘Content-Type’, ‘application/x-www-form-urlencoded; charset=UTF-8′ );
request.setRequestHeader(“Content-length”, parameters.length);
request.setRequestHeader(“Connection”, “close”);
request.send(parameters);

// Note: Here the “%” will cause java.io.CharConversionException: while retriving the percentageNeeded parameter in Servlet.

After:

var vUserEnteredData = document.formname.textbox.value ;  //  textbox = 100%

var parameters = “testId=A101&percentageNeeded=” + escape(vUserEnteredData);

// Some Ajax Code …..

request.setRequestHeader( ‘Content-Type’, ‘application/x-www-form-urlencoded; charset=UTF-8′ );
request.setRequestHeader(“Content-length”, parameters.length);
request.setRequestHeader(“Connection”, “close”);
request.send(parameters);

Alternate Solution:

• We can use Ajax Frameworks rather than manually making the Ajax Request like PrototypeJS, DWR etc.

// Simple Java Script Object

function UserData (user_ID, user_Data_Preference, user_Theme_No){

this.user_ID = user_ID;

this.user_Data_Preference = user_Data_Preference;

this.user_Theme_No = user_Theme_No ;

}

Consider when the Web Page is loaded this object is populated dynamically and we display the user with respective theme and show data in his preferred form. (e.g. Km/Hr or miles/Hr).

Now you can create a duplicate copy of this JavaScript Object by using the clone() function.

Example:

var objUserDataOrg = new UserData(1, data_101, theme_aqua);

// To Create a duplicate copy

var objUserDataDuplicate = objUserDataOrg.clone();

This will be a new object hence changes in the Old Object will not be reflected in the new and vice-versa.

Pros: This is especially useful when you are required to deal with Array of JavaScript Object rather than a single Object.

Cons: All the attributes of the Object are copied into the new object in case you only want some them to be copied this may not work.

Following are the list of things one needs to take care while making an application to implement Internationalization. [click here to read complete article]