在此处关注教程:http://sparkjava.com/
我下载了spark-core
然后编译了这个类:
import static spark.Spark.*;
public class Main {
public static void main(String[] args) {
get("/hello", (req, res) -> "hello world");
}
}
$ javac -classpath ~/Downloads/spark-core-2.6.0.jar Main.java
并在运行时:
$ java -cp "~/Downloads/spark-core-2.6.0.jar:." Main
Exception in thread "main" java.lang.BootstrapMethodError: java.lang.NoClassDefFoundError: spark/Request
at Main.main(Main.java:5)
Caused by: java.lang.NoClassDefFoundError: spark/Request
... 1 more
Caused by: java.lang.ClassNotFoundException: spark.Request
at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:335)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
... 1 more
我做错了什么?
答案 0 :(得分:1)
将引号留在类路径周围:
$ java -cp ~/Downloads/spark-core-2.6.0.jar:. Main.
如果你这样做,你会收到org/slf4j/LoggerFactory
未找到的错误,除非你下载它并将其包含在类路径中,否则确实会丢失。