safari: Entries tagged [java]

Configure a WebDAV folder using Tomcat 6

Tomcat 6 comes prebundled with a WebDAV servlet. To enable the servlet, add the following to web.xml

<servlet>
  <servlet-name>webdav</servlet-name>
  <servlet-class>org.apache.catalina.servlets.WebdavServlet</servlet-class>
  <init-param>
    <param-name>debug</param-name>
    <param-value>0</param-value>
  </init-param>
  <init-param>
    <param-name>listings</param-name>
    <param-value>true</param-value>
  </init-param>

  <!-- The following for read-write access -->
  <init-param>
    <param-name>readonly</param-name>
    <param-value>false</param-value>
  </init-param>
</servlet>

<servlet-mapping>
  <servlet-name>webdav</servlet-name>
  <url-pattern>/*</url-pattern>
</servlet-mapping>

To provide security for WebDAV using Tomcat realms, add the following to web.xml

<security-constraint>
        <web-resource-collection>
                <web-resource-name>webdavapp</web-resource-name>
                <url-pattern>/*</url-pattern>
                <http-method>PROPFIND</http-method>
                <http-method>PROPPATCH</http-method>
                <http-method>COPY</http-method>
                <http-method>MOVE</http-method>
                <http-method>LOCK</http-method>
                <http-method>UNLOCK</http-method>
        </web-resource-collection>

        <auth-constraint>
                <role-name>*</role-name>
        </auth-constraint>
</security-constraint>
<login-config>
        <auth-method>BASIC</auth-method>
        <realm-name>webdavapp</realm-name>
</login-config>
<security-role>
        <description>WebDAV User</description>
        <role-name>webdav</role-name>
</security-role>

and add a new role and user to conf/tomcat-users.xml:

<role rolename="webdav"/>
<user username="webdavuser" password="password" roles="webdav"/>

TomcatMBeanViewer

Preliminary information

Tomcat 4 uses already the JMX-API. But there is no easy way to get a list of all available MBeans.

Sun's JMX page

JMX stands for Java Management extensions.

Tested Environment

Java 1.4
Tomcat 4.1

MBeanViewer web application

Insert this code in your servlet or JSP.

    MBeanServer mBeanServer = null;
    ArrayList arrayList = MBeanServerFactory.findMBeanServer(null);
    if (arrayList.size() > 0) {
        mBeanServer = (MBeanServer)arrayList.get(0);
    } else {
        mBeanServer = MBeanServerFactory.createMBeanServer();
    }

    Set allMBeans = mBeanServer.queryNames(null,null);
    for(Iterator i = allMBeans.iterator(); i.hasNext(); ) {
       ObjectName objectName = (ObjectName)i.next();

       log.debug(objectName.getDomain()); 
       log.debug(objectName.getCanonicalName());
    }

Results

Domain	Canonical Name
Catalina	Catalina:name=channelSocket,type=JkHandler
Catalina	Catalina:host=localhost,name=users,path=/manager,resourcetype=Context,service=Tomcat-Standalone,type=ResourceLink
Catalina	Catalina:resourcetype=Global,type=NamingResources
...	...

Log4jSessionFilter

Preliminary information

Log4J allows to attach information to the current thread. Log4J calls this NDC. NDC stands for "Nested Diagnostic Context".

Log4J about NDC

Tested Environment

Java 1.4 /1.5
Log4j 1.2.x
Servlet API 2.3/2.4

Instructions

1. To include in every log message the current session-ID add a ServletFilter which attachs the session-ID to the NDC

public class Log4JFilter implements Filter {

    public void doFilter(
            ServletRequest request,
            ServletResponse response,
            FilterChain chain)
            throws IOException, ServletException {

        String contextInformation = "";

        if (request instanceof HttpServletRequest) {
            HttpServletRequest httpRequest = (HttpServletRequest)request;
            contextInformation += httpRequest.getSession().getId();
        }

        // push information
        NDC.push(contextInformation);

        try {
            chain.doFilter(request, response);
        } finally {
            // clean up NDC
            NDC.remove();
        }
    }
}

2. Enable the filter in web.xml

  <filter>
    <filter-name>Log4JFilter</filter-name>
    <display-name>Log4JFilter</display-name>
    <description>Intercepting Filter that provides Log4J context information</description>
    <filter-class>Log4JFilter </filter-class>
  </filter>

  <filter-mapping>
    <filter-name>Log4JContextFilter</filter-name>
    <url-pattern>*.do</url-pattern>
  </filter-mapping>

3. Add the context information to the log4j-Pattern. Relevant to NDC is "%x".

   <param name="ConversionPattern" value="%d [%x] %-5p %c - %m"/>

Resulting logfile

2006-05-26 17:02:45,171 [R0rhSjqecO1gSGBDjj9omt] INFO com.Foo - bar() has been called