"+category+": could not find class "+classname
+" from file "+jarFile
+"
"+errorText
+url
+"
");
return 1;
} else {
String location = getLocation(out, clazz);
if(location == null) {
out.write("Found "+ description + " (" + classname + ")
");
}
else {
out.write("Found "+ description + " (" + classname + ") at " + location + "
");
}
return 0;
}
} catch(NoClassDefFoundError ncdfe) {
String url="";
if(homePage!=null) {
url="
See "+homePage+"";
}
out.write("
"+category+": could not find a dependency"
+" of class "+classname
+" from file "+jarFile
+"
"+errorText
+url
+"
The root cause was: "+ncdfe.getMessage()
+"
This can happen e.g. if "+classname+" is in"
+" the 'common' classpath, but a dependency like "
+" activation.jar is only in the webapp classpath."
+"
"); return 1; } } /** * get the location of a class * @param out * @param clazz * @return the jar file or path where a class was found */ String getLocation(JspWriter out, Class clazz) { try { java.net.URL url = clazz.getProtectionDomain().getCodeSource().getLocation(); String location = url.toString(); if(location.startsWith("jar")) { url = ((java.net.JarURLConnection)url.openConnection()).getJarFileURL(); location = url.toString(); } if(location.startsWith("file")) { java.io.File file = new java.io.File(url.getFile()); return file.getAbsolutePath(); } else { return url.toString(); } } catch (Throwable t){ } return "an unknown location"; } /** * a class we need if a class is missing * @param out stream to print stuff * @param classname class to look for * @param jarFile where this class comes from * @param errorText extra error text * @param homePage where to d/l the library * @throws IOException when needed * @return the number of missing libraries (0 or 1) */ int needClass(JspWriter out, String classname, String jarFile, String description, String errorText, String homePage) throws IOException { return probeClass(out, "Error", classname, jarFile, description, errorText, homePage); } /** * print warning message if a class is missing * @param out stream to print stuff * @param classname class to look for * @param jarFile where this class comes from * @param errorText extra error text * @param homePage where to d/l the library * @throws IOException when needed * @return the number of missing libraries (0 or 1) */ int wantClass(JspWriter out, String classname, String jarFile, String description, String errorText, String homePage) throws IOException { return probeClass(out, "Warning", classname, jarFile, description, errorText, homePage); } /** * probe for a resource existing, * @param out * @param resource * @param errorText * @throws Exception */ int wantResource(JspWriter out, String resource, String errorText) throws Exception { if(!resourceExists(resource)) { out.write("
Warning: could not find resource "+resource
+"
"
+errorText);
return 0;
} else {
out.write("found "+resource+"
");
return 1;
}
}
/**
* get servlet version string
*
*/
public String getServletVersion() {
ServletContext context=getServletConfig().getServletContext();
int major = context.getMajorVersion();
int minor = context.getMinorVersion();
return Integer.toString(major) + '.' + Integer.toString(minor);
}
/**
* what parser are we using.
* @return the classname of the parser
*/
private String getParserName() {
SAXParser saxParser = getSAXParser();
if (saxParser == null) {
return "Could not create an XML Parser";
}
// check to what is in the classname
String saxParserName = saxParser.getClass().getName();
return saxParserName;
}
/**
* Create a JAXP SAXParser
* @return parser or null for trouble
*/
private SAXParser getSAXParser() {
SAXParserFactory saxParserFactory = SAXParserFactory.newInstance();
if (saxParserFactory == null) {
return null;
}
SAXParser saxParser = null;
try {
saxParser = saxParserFactory.newSAXParser();
} catch (Exception e) {
}
return saxParser;
}
/**
* get the location of the parser
* @return path or null for trouble in tracking it down
*/
private String getParserLocation(JspWriter out) {
SAXParser saxParser = getSAXParser();
if (saxParser == null) {
return null;
}
String location = getLocation(out,saxParser.getClass());
return location;
}
%>
Note: Even if everything this page probes for is present, there is no guarantee your web service will work, because there are many configuration options that we do not check for. These tests are necessary but not sufficient
| Servlet version | <%= servletVersion %> |
| XML Parser | <%= xmlParser %> |
| XML ParserLocation | <%= xmlParserLocation %> |
We recommend Xerces 2 over Crimson as the XML parser for Axis
<% } %>");
for (;e.hasMoreElements();) {
String key = (String) e.nextElement();
out.write(key + "=" + System.getProperty(key)+"\n");
}
out.write(""); } else { out.write("System properties are not accessible
"); } %>