Got NoClassDefFoundError: wrong name with Windows path

Question

我在下面的路径中有一个TEST123.class。

D:/Users/XXX/Desktop/sem-material-job/sem-material-job/sem-material-freemarkerjob/target/classes/com/ctrip/market/sem/freemarkerjob/dynamicjava/

然后我运行下面的 try 子句通过 URLClassLoader 加载 class ，但是它给了我异常 ava.lang.NoClassDefFoundError: TEST123 (wrong name:, how to solve the exception ？

ava.lang.NoClassDefFoundError: TEST123 (wrong name: com/ctrip/market/sem/freemarkerjob/dynamicjava/TEST123)
    at java.lang.ClassLoader.defineClass1(Native Method)
    at java.lang.ClassLoader.defineClass(ClassLoader.java:800)
    at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
    at java.net.URLClassLoader.defineClass(URLClassLoader.java:449)

   try {
                URLClassLoader mycl = new URLClassLoader(new URL[] { new URL(
                        "file:///D:/Users/XXX/Desktop/sem-material-job/sem-material-job/sem-material-freemarkerjob/target/classes/com/ctrip/market/sem/freemarkerjob/dynamicjava/") });
                Class c2 = mycl.loadClass("TEST123");
            } catch (Exception e) {
                e.printStackTrace();
            }

Answer 1

您正在尝试加载 class TEST123，但您的 TEST123.class 文件包含 class com.ctrip.market.sem.freemarkerjob.dynamicjava.TEST123。 TEST123.java第一行的包是什么？将代码更改为

URLClassLoader mycl = new URLClassLoader(new URL[] { 
        new URL("file:///D:/Users/XXX/Desktop/sem-material-job/sem-material-job/sem-material-freemarkerjob/target/classes/") });
Class c2 = mycl.loadClass("com.ctrip.market.sem.freemarkerjob.dynamicjava.TEST123");

应该可以。

Answer 2

我认为你必须更改 URL 以指向 class 路径并按包名称加载 class，像这样

URLClassLoader mycl = new URLClassLoader(new URL[] { 
new URL("file:///D:/Users/XXX/Desktop/sem-material-job/sem-material-‌job/sem-material-fre‌emarkerjob/target/cl‌asses/") }); 

Class c2 = mycl.loadClass("com.ctrip.market.sem.freemarkerjob.dynamicja‌va.TEST123");

Got NoClassDefFoundError: wrong name with Windows path

Got NoClassDefFoundError: wrong name with Windows path

java

classloader

urlclassloader