Java Utililty Methods ClassLoader

List of utility methods to do ClassLoader

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Description

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

Method

StringreadFromFile(Object obj, String fileName)
read From File 
return readFile(getFileFromPath(obj, fileName));
JsonNodereadSampleJson(String name)
read Sample Json 
URL jsonUrl = Thread.currentThread().getContextClassLoader().getResource(name);
ObjectMapper mapper = new ObjectMapper();
try {
    return mapper.readValue(jsonUrl, JsonNode.class);
} catch (IOException e) {
    throw new IllegalStateException(e);
voidsaveProperties(Properties properties, String name)
save Properties 
try {
    String configsDataDir = System.getProperty("repox.data.dir");
    String configurationFile;
    if (configDataDirAlreadyExists(configsDataDir, name))
        configurationFile = URLDecoder.decode(configsDataDir + File.separator + name, "ISO-8859-1");
    else {
        URL configurationURL = Thread.currentThread().getContextClassLoader().getResource(name);
        configurationFile = URLDecoder.decode(configurationURL.getFile(), "ISO-8859-1");
...
ListscanPackage(String path)
scan Package 
List<String> clazzs = new LinkedList<>();
try {
    path = path.replaceAll("\\.", "/");
    ClassLoader classLoader = Thread.currentThread().getContextClassLoader();
    Enumeration<URL> resources = classLoader.getResources(path);
    File[] files = new File(resources.nextElement().getFile()).listFiles();
    for (File file : files) {
        if (file.isDirectory()) {
...
ListsearchByAttributeKey(String key)
search By Attribute Key 
try {
    Enumeration<URL> resEnum = Thread.currentThread().getContextClassLoader()
            .getResources(JarFile.MANIFEST_NAME);
    List<Manifest> resultList = Lists.newLinkedList();
    while (resEnum.hasMoreElements()) {
        URL url = resEnum.nextElement();
        try (InputStream is = url.openStream()) {
            Manifest manifest = new Manifest(is);
...
voidstorePropertiesFile(String fileName, String filePath, String storeComment)
store Properties File 
if (fileName == null || "".equals(fileName.trim())) {
    throw new RuntimeException("File name is null");
} else {
    fileName = fileName.trim();
    if (!fileName.toLowerCase().endsWith(".properties")) {
        fileName += ".properties";
File propertiesFile = null;
OutputStream out;
try {
    if (filePath == null || "".equals(filePath.trim())) {
        filePath = Thread.currentThread().getContextClassLoader().getResource("").toString() + fileName;
        propertiesFile = new File(new URL(filePath).toURI());
    } else {
        filePath = filePath.trim();
        if (!filePath.endsWith("/") && !filePath.endsWith("\\")) {
            filePath += "/";
        filePath += fileName;
        propertiesFile = new File(filePath);
    out = new FileOutputStream(propertiesFile);
    properties.store(out, storeComment);
    out.close();
} catch (Exception e) {
    e.printStackTrace();
Class[]toTypeArray(String[] s)
Converts an array of Class names to Class types 
if (s == null)
    return null;
Class[] c = new Class[s.length];
for (int i = 0; i < s.length; i++) {
    c[i] = forName(s[i]);
return c;