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Original file line number Diff line number Diff line change
Expand Up @@ -139,20 +139,49 @@ object ClassLoaderUtils extends Logger {

@throws[Exception]
private[this] def addURL(file: File): Unit = {
val classLoader = ClassLoader.getSystemClassLoader
val url = file.toURI.toURL
val classLoaders = Seq(
Option(Thread.currentThread().getContextClassLoader),
Option(ClassLoader.getSystemClassLoader)).flatten.distinct

var lastError: Exception = null
classLoaders.foreach { classLoader =>
try {
addURLToClasspath(classLoader, url)
return
} catch {
case e: Exception => lastError = e
}
}
throw lastError
}

private[this] def addURLToClasspath(classLoader: ClassLoader, url: URL): Unit = {
classLoader match {
case c if c.isInstanceOf[URLClassLoader] =>
val addURL = classOf[URLClassLoader].getDeclaredMethod("addURL", Array(classOf[URL]): _*)
case urlClassLoader: URLClassLoader =>
val addURL =
classOf[URLClassLoader].getDeclaredMethod("addURL", Array(classOf[URL]): _*)
addURL.setAccessible(true)
addURL.invoke(c, file.toURI.toURL)
addURL.invoke(urlClassLoader, url)
case _ =>
val field = classLoader.getClass.getDeclaredField("ucp")
field.setAccessible(true)
val ucp = field.get(classLoader)
var clazz: Class[_] = classLoader.getClass
var ucpField: java.lang.reflect.Field = null
while (clazz != null && ucpField == null) {
try {
ucpField = clazz.getDeclaredField("ucp")
} catch {
case _: NoSuchFieldException => clazz = clazz.getSuperclass
}
}
if (ucpField == null) {
throw new NoSuchFieldException("ucp")
}
ucpField.setAccessible(true)
val ucp = ucpField.get(classLoader)
val addURL =
ucp.getClass.getDeclaredMethod("addURL", Array(classOf[URL]): _*)
addURL.setAccessible(true)
addURL.invoke(ucp, file.toURI.toURL)
addURL.invoke(ucp, url)
}
}
}
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