{"id":4050,"date":"2014-10-03T07:28:05","date_gmt":"2014-10-03T05:28:05","guid":{"rendered":"https:\/\/www.dbi-services.com\/blog\/java-get-class-names-from-package-string-in-classpath\/"},"modified":"2014-10-03T07:28:05","modified_gmt":"2014-10-03T05:28:05","slug":"java-get-class-names-from-package-string-in-classpath","status":"publish","type":"post","link":"https:\/\/www.dbi-services.com\/blog\/java-get-class-names-from-package-string-in-classpath\/","title":{"rendered":"Java get Class names from package String in classpath"},"content":{"rendered":"

\"\"<\/p>\n

As a Java developer you probably used to know about reflexion. However, in order to keep your software architecture flexible, some functionalities are sometimes not provided out of the box by the JVM.
\nIn my particular case, I needed to find out every Class and Sub-Classes inside a package, thus reparteed within several Jars.
\nInternet has lots of solution, but it remains complicated for everybody to reach this goal. After googleing, I found a link which provided a partial solution. I would like to thank the website author:<\/p>\n

http:\/\/www.java2s.com\/Code\/Java\/Reflection\/Attemptstolistalltheclassesinthespecifiedpackageasdeterminedbythecontextclassloader.htm<\/a><\/p>\n

Some other solution invited us to deploy external libraries as well. But I was not interested to manage another lib in my soft just for that purpose.
\nSo, the solution was to recover all jars from the context classloader and loop on them in order to find out the classes we are looking for.
\nFollowing, you will see a complete Java class resolving this issue:<\/p>\n

import java.io.File;<\/p>\n

import java.io.IOException;<\/p>\n

import java.io.UnsupportedEncodingException;<\/p>\n

import java.net.URL;<\/p>\n

import java.net.URLClassLoader;<\/p>\n

import java.net.URLDecoder;<\/p>\n

import java.util.ArrayList;<\/p>\n

import java.util.Enumeration;<\/p>\n

import java.util.HashMap;<\/p>\n

import java.util.List;<\/p>\n

import java.util.jar.JarEntry;<\/p>\n

import java.util.jar.JarFile;<\/p>\n

\/**<\/p>\n

\u00a0*<\/p>\n

\u00a0*<\/p>\n

\u00a0*<\/p>\n

\u00a0* @author Philippe Schweitzer dbi services Switzerland<\/p>\n

\u00a0*<\/p>\n

\u00a0*\/<\/p>\n

public class ClassFinder {<\/p>\n

\u00a0 \u00a0 public static void main(String[] args) throws ClassNotFoundException {<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 List<Class> classes = ClassFinder.getClassesFromPackage(“YOUR PACKAGE NAME”);<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 System.out.println(“START ClassList:”);<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 for (Class c : classes) {<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 System.out.println(c.toString());\/\/ + ” ” + c.getCanonicalName());<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 }<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 System.out.println(“END ClassList:”);<\/p>\n

\u00a0 \u00a0 }<\/p>\n

\u00a0 \u00a0 \/**<\/p>\n

\u00a0 \u00a0 \u00a0*<\/p>\n

\u00a0 \u00a0 \u00a0* Attempts to list all the classes in the specified package as determined \u00a0 \u00a0 *<\/p>\n

\u00a0 \u00a0 \u00a0* by the context class loader…<\/p>\n

\u00a0 \u00a0 \u00a0*<\/p>\n

\u00a0 \u00a0 \u00a0* @param pckgname the package name to search<\/p>\n

\u00a0 \u00a0 \u00a0* @return a list of classes that exist within that package<\/p>\n

\u00a0 \u00a0 \u00a0* @throws ClassNotFoundException if something went wrong<\/p>\n

\u00a0 \u00a0 \u00a0*<\/p>\n

\u00a0 \u00a0 \u00a0*\/<\/p>\n

\u00a0 \u00a0 public static List getClassesFromPackage(String pckgname) throws ClassNotFoundException {<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 ArrayList result = new ArrayList();<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 ArrayList<File> directories = new ArrayList();<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 HashMap packageNames = null;<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 try {<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 for (URL jarURL : ((URLClassLoader) Thread.currentThread().getContextClassLoader()).getURLs()) {<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 System.out.println(“JAR: ” + jarURL.getPath());<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 getClassesInSamePackageFromJar(result, pckgname, jarURL.getPath());<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 String path = pckgname;<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 Enumeration<URL> resources = cld.getResources(path);<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 File directory = null;<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 while (resources.hasMoreElements()) {<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 String path2 = resources.nextElement().getPath();<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 directory = new File(URLDecoder.decode(path2, “UTF-8”));<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 directories.add(directory);<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 }<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 if (packageNames == null) {<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 packageNames = new HashMap();<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 }<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 packageNames.put(directory, pckgname);<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 }<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 } catch (NullPointerException x) {<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 throw new ClassNotFoundException(pckgname + ” does not appear to be a valid package (Null pointer exception)”);<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 } catch (UnsupportedEncodingException encex) {<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 throw new ClassNotFoundException(pckgname + ” does not appear to be a valid package (Unsupported encoding)”);<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 } catch (IOException ioex) {<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 throw new ClassNotFoundException(“IOException was thrown when trying to get all resources for ” + pckgname);<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 }<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 for (File directory : directories) {<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 if (directory.exists()) {<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 String[] files = directory.list();<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 for (String file : files) {<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 if (file.endsWith(“.class”)) {<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 try {<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \/\/ \u00a0 \u00a0 \u00a0System.out.println(packageNames.get(directory).toString() + ‘.’ + file.substring(0, file.length() – 6));<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 result.add(Class.forName(packageNames.get(directory).toString() + ‘.’ + file.substring(0, file.length() – 6)));<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 } catch (Throwable e) {<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 }<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 }<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 }<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 } else {<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 throw new ClassNotFoundException(pckgname + ” (” + directory.getPath() + “) does not appear to be a valid package”);<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 }<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 }<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 return result;<\/p>\n

\u00a0 \u00a0 }<\/p>\n

\u00a0 \u00a0 \/**<\/p>\n

\u00a0 \u00a0 \u00a0*<\/p>\n

\u00a0 \u00a0 \u00a0* Returns the list of classes in the same directories as Classes in<\/p>\n

\u00a0 \u00a0 \u00a0* classes.<\/p>\n

\u00a0 \u00a0 \u00a0*<\/p>\n

\u00a0 \u00a0 \u00a0* @param result<\/p>\n

\u00a0 \u00a0 \u00a0* @param classes<\/p>\n

\u00a0 \u00a0 \u00a0* @param jarPath<\/p>\n

\u00a0 \u00a0 \u00a0*<\/p>\n

\u00a0 \u00a0 \u00a0*\/<\/p>\n

\u00a0 \u00a0 private static void getClassesInSamePackageFromJar(List result, String packageName, String jarPath) {<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 JarFile jarFile = null;<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 try {<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 jarFile = new JarFile(jarPath);<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 Enumeration<JarEntry> en = jarFile.entries();<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 while (en.hasMoreElements()) {<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 JarEntry entry = en.nextElement();<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 String entryName = entry.getName();<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 packageName = packageName.replace(‘.’, ‘\/’);<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 if (entryName != null && entryName.endsWith(“.class”) && entryName.startsWith(packageName)) {<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 try {<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 Class entryClass = Class.forName(entryName.substring(0, entryName.length() – 6).replace(‘\/’, ‘.’));<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 if (entryClass != null) {<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 result.add(entryClass);<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 }<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 } catch (Throwable e) {<\/p>\n

\/\/ do nothing, just continue processing classes<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 }<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 }<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 }<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 } catch (Exception e) {<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 } finally {<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 try {<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 if (jarFile != null) {<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 jarFile.close();<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 }<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 } catch (Exception e) {<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 }<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 }<\/p>\n

\u00a0 \u00a0 }<\/p>\n

}<\/p>\n","protected":false},"excerpt":{"rendered":"

As a Java developer you probably used to know about reflexion. However, in order to keep your software architecture flexible, some functionalities are sometimes not provided out of the box by the JVM. In my particular case, I needed to find out every Class and Sub-Classes inside a package, thus reparteed within several Jars. Internet […]<\/p>\n","protected":false},"author":40,"featured_media":4051,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[197],"tags":[497,214,498,499],"type_dbi":[],"class_list":["post-4050","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-application-integration-middleware","tag-classloader","tag-java","tag-java-class","tag-java-package"],"acf":[],"yoast_head":"\nJava get Class names from package String in classpath - dbi Blog<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.dbi-services.com\/blog\/java-get-class-names-from-package-string-in-classpath\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Java get Class names from package String in classpath\" \/>\n<meta property=\"og:description\" content=\"As a Java developer you probably used to know about reflexion. However, in order to keep your software architecture flexible, some functionalities are sometimes not provided out of the box by the JVM. In my particular case, I needed to find out every Class and Sub-Classes inside a package, thus reparteed within several Jars. 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