Simple code to dynamically discover Java classes. See http://stackoverflow.com/questions/176527/how-can-i-enumerate-all-classes-in-a-package-and-add-them-to-a-list/3527428#3527428
License: Other
I get a FileNotFoundException when going through a jar file if the jar file or its path contain a space:
C:\Users\foobar\test>java -jar "Class Enumeration.jar"
ClassDiscovery: Package: com.example.test.dynamic becomes Path:com/example/test/dynamic
ClassDiscovery: Resource = jar:file:/C:/Users/foobar/test/Class%20Enumeration.jar!/com/example/test/dynamic
ClassDiscovery: FullPath = jar:file:/C:/Users/foobar/test/Class%20Enumeration.jar!/com/example/test/dynamic
ClassDiscovery: Directory = null
Exception in thread "main" java.lang.RuntimeException: com.example.test.dynamic (null) does not appear to be a valid package
at com.example.test.dynamic.ClassEnumerator.getClassesForPackage(ClassEnumerator.java:80)
at com.example.test.dynamic.ClassEnumerator.main(ClassEnumerator.java:87)
Caused by: java.io.FileNotFoundException: C:\Users\foobar\test\Class%20Enumeration.jar (The system cannot find the file specified)
at java.util.zip.ZipFile.open(Native Method)
at java.util.zip.ZipFile.<init>(Unknown Source)
at java.util.zip.ZipFile.<init>(Unknown Source)
at java.util.jar.JarFile.<init>(Unknown Source)
at java.util.jar.JarFile.<init>(Unknown Source)
at com.example.test.dynamic.ClassEnumerator.getClassesForPackage(ClassEnumerator.java:62)
... 1 more
The ClassEnumerator class contains the following main method as well as the methods posted on StackOverflow:
public static void main(String... args0) {
getClassesForPackage(Package.getPackage("com.example.test.dynamic"));
}I'm running on Win 7, 64bit. Here is my Java version:
java version "1.8.0_20"
Java(TM) SE Runtime Environment (build 1.8.0_20-b26)
Java HotSpot(TM) Client VM (build 25.20-b23, mixed mode, sharing)
I have the following directory setup
src
+---main
| +---java
| | +---com
| | | \---example
| | | \---test
| | | \---dynamic
| | | | ClassEnumerator.java
| | | |
| | | \---classes
| | | | MainDirTestClass.java
| | | |
| | | \---subpackage
| | | SubPackageTestClass.java
| | \---META-INF
| | MANIFEST.MF
| \---resources
\---test
\---java
search each and every .class from a directory or jar (nested possible) instead searching for only package.
I have a use case which i think i can add it here too.
I run with the Junit in test-class,it cann't get the files in class package.
So that means this class can not work with unit test.
Thanks a lot:)
PS:what about use this?
Thread.currentThread().getContextClassLoader().getResources
I am using this class file as a library in Fake Java OS. Because of that, can you add a license file describing which license is used in this file?
I have the following directory setup
src
+---main
| +---java
| | +---com
| | | \---example
| | | \---test
| | | \---dynamic
| | | | ClassEnumerator.java
| | | |
| | | \---classes
| | | | MainDirTestClass.java
| | | |
| | | \---subpackage
| | | SubPackageTestClass.java
| | \---META-INF
| | MANIFEST.MF
| \---resources
\---test
\---java
The ClassEnumerator class contains the following main method as well as the methods posted on StackOverflow:
public static void main(String... args0) {
getClassesForPackage(Package.getPackage("com.example.test.dynamic"));
}This produces the following error message:
C:\...\test>java -jar ClassEnumeration.jar
ClassDiscovery: Package: com.example.test.dynamic becomes Path:com/example/test/dynamic
ClassDiscovery: Resource = jar:file:/C:/.../test/ClassEnumeration.jar!/com/example/test/dynamic
ClassDiscovery: FullPath = jar:file:/C:/.../test/ClassEnumeration.jar!/com/example/test/dynamic
ClassDiscovery: Directory = null
ClassDiscovery: JarEntry: com/example/test/dynamic/ClassEnumerator.class
ClassDiscovery: className = com.example.test.dynamic.ClassEnumerator
ClassDiscovery: JarEntry: com/example/test/dynamic/classes/
ClassDiscovery: className = com.example.test.dynamices.
Exception in thread "main" java.lang.RuntimeException: ClassNotFoundException loading com.example.test.dynamices.
at com.example.test.dynamic.ClassEnumerator.getClassesForPackage(ClassEnumerator.java:75)
at com.example.test.dynamic.ClassEnumerator.main(ClassEnumerator.java:87)
Any idea where the "...es." comes from in "com.example.test.dynamices"?
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