外部 jar 的 Java 类路径问题

Question

我在编译外部 jar 和源代码时遇到问题。我的 .java 文件和外部 jar 位于同一目录中。这是我的 makefile:

JFLAGS = -g
JC = javac -cp ${CLASSPATH}
.SUFFIXES: .java .class
.java.class:
        $(JC) $(JFLAGS) $*.java

CLASSPATH = *.jar 

CLASSES = \
        AESCBC.java

default: classes

classes: $(CLASSES:.java=.class)

clean:
        $(RM) *.class

编译成功。但是，当我运行java AESCBC时，出现以下错误:

Exception in thread "main" java.lang.NoClassDefFoundError: org/bouncycastle/jce/provider/BouncyCastleProvider
    at java.lang.Class.getDeclaredMethods0(Native Method)
    at java.lang.Class.privateGetDeclaredMethods(Class.java:2693)
    at java.lang.Class.privateGetMethodRecursive(Class.java:3040)
    at java.lang.Class.getMethod0(Class.java:3010)
    at java.lang.Class.getMethod(Class.java:1776)
    at sun.launcher.LauncherHelper.validateMainClass(LauncherHelper.java:544)
    at sun.launcher.LauncherHelper.checkAndLoadMain(LauncherHelper.java:526)
Caused by: java.lang.ClassNotFoundException: org.bouncycastle.jce.provider.BouncyCastleProvider
    at java.net.URLClassLoader$1.run(URLClassLoader.java:372)
    at java.net.URLClassLoader$1.run(URLClassLoader.java:361)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(URLClassLoader.java:360)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:357)

Answer 1

运行类时需要指定依赖项。假设您的类没有编译成 JAR，您将像这样运行它:

java -cp [在此放置您的依赖项] AESCBC