Java Utililty Methods ClassPath

List of utility methods to do ClassPath

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Description

The list of methods to do ClassPath are organized into topic(s).

Method

URLloadFromClasspath(Class clazz, String fileName)
load From Classpath 
URL dirURL = clazz.getResource("/" + fileName);
if (dirURL == null)
    return null;
URL url = null;
try {
    String dirPath = dirURL.getPath();
    if (dirURL.getProtocol().equals("jar")) {
        int exclamation = dirPath.indexOf("!");
...
URLloadFromClasspath(final String configFileName)
Returns a URL pointing to the given config file. 
final ClassLoader cl = Thread.currentThread().getContextClassLoader();
if (cl == null) {
    return ClassLoader.getSystemResource(configFileName);
} else {
    return cl.getResource(configFileName);
URLloadResourceFromClasspath(Class clazz, String resourceName)
Attempts to load a given resource from the classpath. 
URL ret = null;
ret = clazz.getResource(resourceName);
if (ret == null) {
    ret = clazz.getResource("/" + resourceName);
return ret;
URL[]parseClassPath(String classpath)
Parse a Java classpath string to URLs. 
final String splitPattern = Character.toString(File.pathSeparatorChar);
final String wildcardPattern = ".+\\*";
String[] paths = classpath.split(splitPattern);
List<URL> urls = new ArrayList<URL>();
for (String path : paths) {
    path = path.trim();
    if (path.matches(wildcardPattern)) {
        File folder = new File(path.replace("\\*", ""));
...
URL[]parseJavaClassPath()
Returns the URLs in the class path specified by the java.class.path System#getProperty system property . 
ImmutableList.Builder<URL> urls = ImmutableList.builder();
for (String entry : Splitter.on(PATH_SEPARATOR.value()).split(JAVA_CLASS_PATH.value())) {
    try {
        try {
            urls.add(new File(entry).toURI().toURL());
        } catch (SecurityException e) { 
            urls.add(new URL("file", null, new File(entry).getAbsolutePath()));
    } catch (MalformedURLException e) {
        AssertionError error = new AssertionError("malformed class path entry: " + entry);
        error.initCause(e);
        throw error;
return urls.build().toArray(new URL[0]);
voidprintClassPath()
print Class Path 
System.out.println("========================");
System.out.println("     printClassPath");
System.out.println("========================");
ClassLoader cl = ClassLoader.getSystemClassLoader();
URL[] urls = ((URLClassLoader) cl).getURLs();
for (URL url : urls) {
    System.out.println(url.getFile());
System.out.println("----------------------");
System.out.println("");
System.out.println("");
System.out.println("");
voidprintClassPath(boolean single)
print Class Path 
ClassLoader cl = ClassLoader.getSystemClassLoader();
URLClassLoader urlcl = (URLClassLoader) cl;
URL[] urls = urlcl.getURLs();
if (single) {
    String cp = System.getProperty("java.class.path");
    System.out.println(cp);
} else {
    for (URL url : urls) {
...
voidprintJVMClassPath()
print JVM Class Path 
ClassLoader sysClassLoader = ClassLoader.getSystemClassLoader();
URL[] urls = ((URLClassLoader) sysClassLoader).getURLs();
for (int i = 0; i < urls.length; i++)
    System.out.println("   - " + urls[i].getFile());
StringreadFileFromClasspath(String fileName)
read File From Classpath 
URL url = Thread.currentThread().getContextClassLoader().getResource(fileName);
if (url == null)
    throw new IOException("Unable to find file: " + fileName);
return getFileContents(getFilePath(url));
BufferedReaderreadFromClassPath(String filePath)
read From Class Path 
String path = filePath;
System.err.println("!!!reading config!!!");
System.err.println("from : " + filePath);
StringBuffer fileData = new StringBuffer(1000);
URL res = Object.class.getResource(path);
while (res == null && path.contains(".")) {
    path = path.replaceFirst("\\.", Matcher.quoteReplacement(File.separator));
    res = Object.class.getResource(path);
...