implemented simple ClassLoaderLifeCycle to fix integration tests on Java > 8

scm-webapp/src/main/java/sonia/scm/lifecycle/classloading/SimpleClassLoaderLifeCycle.java

@@ -0,0 +1,56 @@
+package sonia.scm.lifecycle.classloading;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.io.Closeable;
+import java.io.IOException;
+import java.util.ArrayDeque;
+import java.util.Deque;
+
+/**
+ * Creates and shutdown SCM-Manager ClassLoaders with ClassLoader leak detection.
+ */
+class SimpleClassLoaderLifeCycle extends ClassLoaderLifeCycle {
+
+  static final String NAME = "simple";
+
+  private static final Logger LOG = LoggerFactory.getLogger(SimpleClassLoaderLifeCycle.class);
+
+  private Deque<ClassLoader> classLoaders = new ArrayDeque<>();
+
+  SimpleClassLoaderLifeCycle(ClassLoader webappClassLoader) {
+    super(webappClassLoader);
+  }
+
+  @Override
+  protected <T extends ClassLoader> T initAndAppend(T classLoader) {
+    LOG.debug("init classloader {}", classLoader);
+    classLoaders.push(classLoader);
+    return classLoader;
+  }
+
+  @Override
+  protected void shutdownClassLoaders() {
+    ClassLoader classLoader = classLoaders.poll();
+    while (classLoader != null) {
+      shutdown(classLoader);
+      classLoader = classLoaders.poll();
+    }
+    // be sure it is realy empty
+    classLoaders.clear();
+    classLoaders = new ArrayDeque<>();
+  }
+
+  private void shutdown(ClassLoader classLoader) {
+    LOG.debug("shutdown classloader {}", classLoader);
+    if (classLoader instanceof Closeable) {
+      LOG.trace("close classloader {}", classLoader);
+      try {
+        ((Closeable) classLoader).close();
+      } catch (IOException e) {
+        LOG.warn("failed to close classloader", e);
+      }
+    }
+  }
+}