2
저는 Scala REPL에서 Guava 라이브러리에 의해 정의 된 Class
객체를 동적으로로드하고 싶습니다. 나는 Class.forName(...)
방법은 잘 작동하고 관리 Class.forName (...) Vs. Thread.currentThread.getContextClassLoader.loadClass (...) behavior
scala> :cp guava-10.0.1.jar
Added '/Users/xxx/guava-10.0.1.jar'. Your new classpath is:
"/Users/rouvoy/Development/tools/axis/default/lib:/Users/xxx/guava-10.0.1.jar"
scala> Class.forName("com.google.common.base.Ascii")
res0: java.lang.Class[_] = class com.google.common.base.Ascii
가
Class
개체를 검색 할 수 있지만, 나는
ContextClassLoader
를 사용하는 경우 이유를 이해하고 싶습니다 : 그러나, 나는 내가
Class
정의를 검색하는 방법에 따라 다른 행동을 관찰 자바에서 완벽하게 작동하는 동안 클래스 정의를 찾을 수 없습니까?
scala> Thread.currentThread.getContextClassLoader.loadClass("com.google.common.base.Ascii")
java.lang.ClassNotFoundException: com.google.common.base.Ascii
at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
at .<init>(<console>:8)
at .<clinit>(<console>)
at .<init>(<console>:11)
at .<clinit>(<console>)
at $print(<console>)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at scala.tools.nsc.interpreter.IMain$ReadEvalPrint.call(IMain.scala:704)
at scala.tools.nsc.interpreter.IMain$Request$$anonfun$14.apply(IMain.scala:920)
at scala.tools.nsc.interpreter.Line$$anonfun$1.apply$mcV$sp(Line.scala:43)
at scala.tools.nsc.io.package$$anon$2.run(package.scala:25)
at java.lang.Thread.run(Thread.java:680)
scala> Class.forName("com.google.common.base.Ascii",true,Thread.currentThread.getContextClassLoader)
java.lang.ClassNotFoundException: com.google.common.base.Ascii
at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:247)
at .<init>(<console>:8)
at .<clinit>(<console>)
at .<init>(<console>:11)
at .<clinit>(<console>)
at $print(<console>)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at scala.tools.nsc.interpreter.IMain$ReadEvalPrint.call(IMain.scala:704)
at scala.tools.nsc.interpreter.IMain$Request$$anonfun$14.apply(IMain.scala:920)
at scala.tools.nsc.interpreter.Line$$anonfun$1.apply$mcV$sp(Line.scala:43)
at scala.tools.nsc.io.package$$anon$2.run(package.scala:25)
at java.lang.Thread.run(Thread.java:680)
또는 -usejavacp를 사용하십시오. –