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Question

I have a maven project named alpha, compiled by java 1.8.0_121 and built with maven 3.3.3.
This project contains three modules

alphaCommon
alphaBusiness
alphaWeb

each module has its pom.xml and the artifact alpha-1.0.war is generated under alphaWeb/target.
This artifact is then deployed to a local JBoss server EAP 7.1.0 running on Windows 10.

The alpha project uses Struts 1 and Hibernate as frameworks, and the dynamic data are saved and retrieved from a MySQL database (database name: alpha, CHARACTER SET NAME: latin1, COLLATION NAME: latin1_swedish_ci) installed to a local MySQL Server, version number 5.0.95.

There is a web page of the project with a form having a input text field named description where stressed characters à, è, é, ì, ò, ù plus other special caracters such as . – % ^ ‘ and blank character should be accepted.

On submit data, a java method addElement() in a class AjaxServlet.java is invoked; it gets an HttpServletRequest input parameter, checks the format of the input data and if matches the pattern of the allowed characters, the input data are added in a database table.

The method addElement is the following

private String addElement(HttpServletRequest request) {

    try {
            request.setCharacterEncoding("UTF-8");
    } catch (UnsupportedEncodingException ue) {             
            loggerajax.traceLog(loggerajax.INFO, ue.getMessage());
            return "WRONG_CHARACTER_ENCODING";
    }

    String sdescr = request.getParameter("description");
    loggerajax.traceLog(loggerajax.INFO, "description: " + sdescr);
    String patternAllowedCharacters = AlphaParameters.getInstance().getParameter("allowed_characters");
    Pattern pattern = Pattern.compile(patternAllowedCharacters, Pattern.CASE_INSENSITIVE);
    Matcher matcher = pattern.matcher(sdescr);
    
    if (!matcher.matches()) {
      return "NO_MATCH";
    }
    
    ....
    
    return "ROW_ADDED_IN_TABLE";
}

the instruction

loggerajax.traceLog(...);

simply creates and adds in a custom JBoss logfile named alpha.log, the string passed as an input parameter, with INFO level.

The strings returned from the addElement method

“WRONG_CHARACTER_ENCODING”
“NO_MATCH”
“ROW_ADDED_IN_TABLE”

result in a specific message on the web.

The instruction

String patternAllowedCharacters = AlphaParameters.getInstance().getParameter("allowed characters");

simply extracts from a table of the alpha database, named tbl_parameters, the following string

[\.-s%A-Za-z0-9òàìèéù’^]*

and assigned to the patternAllowedCharacters String variable.

If sdescr contains a character not found in the above pattern, matcher.matches() returns false and addElement returns
“NO_MATCH”; otherwise, the script goes on and “ROW_ADDED_IN_TABLE” is returned, which means successful operation.

Unfortunately, the stressed characters, despite being in the pattern of the allowed ones, aren’t matched!
I googled around and seems as if the problem is due to a bad character encoding, and UTF-8 should be used! I found several solutions which I implemented all together:

placed the tag <meta charset="UTF-8"/> at the top of all the jsp
pages
set the character encoding to UTF-8 to the HttpServletRequest request
variable (see request.setCharacterEncoding("UTF-8") in the try
block of the addElement method)

added in the struts-config.xml (located at
alpha/alphaWeb/src/main/webapp/WEB-INF) the following plugin

<plug-in className="org.springframework.web.struts.ContextLoaderPlugIn">    
 <set-property property="contextConfigLocation" value="/WEB-INF/web-character-encoding.xml"/></plug-in>

placed the file web-character-encoding.xml under
alpha/alphaWeb/src/main/webapp/WEB-INF with defined the following bean

 <?xml version="1.0" encoding="UTF-8"?>    <beans xmlns="http://www.springframework.org/schema/beans"
          xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
          xsi:schemaLocation="http://www.springframework.org/schema/beans   
http://www.springframework.org/schema/beans/spring-beans.xsd">

       <bean id="characterEncodingFilter" class="org.springframework.web.filter.CharacterEncodingFilter">
           <property name="encoding" value="UTF-8"/>
           <property name="forceEncoding" value="true"/>
       </bean>
       </beans>

added in the web.xml (located at
alpha/alphaWeb/src/main/webapp/WEB-INF) the following filter

 <filter>
 <filter-name>characterEncodingFilter</filter-name>
 <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
 <init-param>
     <param-name>encoding</param-name>
     <param-value>UTF-8</param-value>
 </init-param>
 <init-param>
     <param-name>forceEncoding</param-name>
     <param-value>true</param-value>
 </init-param>   </filter>       <filter-mapping>
 <filter-name>characterEncodingFilter</filter-name>
 <url-pattern>/*</url-pattern>   </filter-mapping>

added in the pom.xml of the alphaWeb module the following
dependencies

<dependency> <groupId>org.springframework</groupId> <artifactId>spring-orm</artifactId> <version>2.5.4</version> <scope>compile</scope> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-beans</artifactId> <version>2.5.4</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-web</artifactId> <version>2.5.4</version> </dependency>

(note: unfortunately I am not allowed to upgrade the version of the project and all of its maven dependencies, nor changing the charset or the collation of the database and tables!)

I checked out the server.log but I get no error; in the alpha.log file, the value of sdescr is the following:

description: ?

the file standalone.xml in the JBoss server, has the following configuration for the alpha.log file:

<profile>
    <subsystem xmlns="urn:jboss:domain:logging:3.0">
        <console-handler name="CONSOLE">
            <level name="INFO"/>
            <encoding value="UTF-8"/>
            <target name="console"/>
        </console-handler>
        <file-handler name="ALPHA_FILE">
            <level name="DEBUG"/>
            <encoding value="UTF-8"/>
            <file relative-to="jboss.server.log.dir" path="alpha.log"/>
        </file-handler>
        <periodic-size-rotating-file-handler name="FILE" autoflush="true">
            <level name="DEBUG"/>
            <formatter>
                <named-formatter name="PATTERN"/>
            </formatter>
            <file relative-to="jboss.server.log.dir" path="server.log"/>
            <rotate-size value="3072k"/>
            <max-backup-index value="3"/>
            <suffix value=".yyyy-MM-dd"/>
            <append value="true"/>
        </periodic-size-rotating-file-handler>
        <logger category="com.arjuna">
            <level name="WARN"/>
        </logger>
        <logger category="org.jboss.as.config">
            <level name="INFO"/>
        </logger>
        <logger category="sun.rmi">
            <level name="WARN"/>
        </logger>
        <logger category="org.hibernate" use-parent-handlers="false">
            <level name="ERROR"/>
        </logger>
        <logger category="org.apache.struts" use-parent-handlers="false">
            <level name="ERROR"/>
        </logger>
        <logger category="org.springframework" use-parent-handlers="false">
            <level name="ERROR"/>
        </logger>
        <root-logger>
            <level name="INFO"/>
            <handlers>
                <handler name="CONSOLE"/>
                <handler name="FILE"/>
            </handlers>
        </root-logger>
        <formatter name="PATTERN">
            <pattern-formatter pattern="%d{yyyy-MM-dd HH:mm:ss,SSS} %-5p [%c] (%t) %s%e%n"/>
        </formatter>
        <formatter name="COLOR-PATTERN">
            <pattern-formatter pattern="%K{level}%d{HH:mm:ss,SSS} %-5p [%c] (%t) %s%e%n"/>
        </formatter>
    </subsystem>
    
    ...
</profile>

hope I gave you all information. Thank you very much for any help or useful suggestion!

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Danh mục

stressed characters not mached after submitting a form in a Java web application