improve handling of startup error handling

scm-core/src/main/java/sonia/scm/BasicContextProvider.java

@@ -89,9 +89,16 @@ public class BasicContextProvider implements SCMContextProvider
    */
   public BasicContextProvider()
   {
-    baseDirectory = findBaseDirectory();
-    version = loadVersion();
-    stage = loadProjectStage();
+    try
+    {
+      baseDirectory = findBaseDirectory();
+      version = loadVersion();
+      stage = loadProjectStage();
+    }
+    catch (Throwable ex)
+    {
+      this.startupError = ex;
+    }
   }
 
   //~--- methods --------------------------------------------------------------
@@ -137,6 +144,18 @@ public class BasicContextProvider implements SCMContextProvider
     return stage;
   }
 
+  /**
+   * {@inheritDoc}
+   *
+   *
+   * @return
+   */
+  @Override
+  public Throwable getStartupError()
+  {
+    return startupError;
+  }
+
   /**
    * Returns the version of the SCM-Manager. If the version is not set, the
    * {@link #DEFAULT_VERSION} is returned.
@@ -182,7 +201,16 @@ public class BasicContextProvider implements SCMContextProvider
 
     if (!directory.exists() &&!directory.mkdirs())
     {
-      throw new IllegalStateException("could not create directory");
+      String msg = "could not create home directory at ".concat(
+                       directory.getAbsolutePath());
+
+      // do not use logger
+      // http://www.slf4j.org/codes.html#substituteLogger
+      System.err.println("===================================================");
+      System.err.append("Error: ").println(msg);
+      System.err.println("===================================================");
+
+      throw new IllegalStateException(msg);
     }
 
     return directory;
@@ -319,6 +347,9 @@ public class BasicContextProvider implements SCMContextProvider
   /** stage of the current SCM-Manager instance */
   private Stage stage;
 
+  /** startup exception */
+  private Throwable startupError;
+
   /** the version of the SCM-Manager */
   private String version;
 }

scm-core/src/main/java/sonia/scm/SCMContextProvider.java

@@ -74,6 +74,16 @@ public interface SCMContextProvider extends Closeable
    */
   public Stage getStage();
 
+  /**
+   * Returns a exception which is occurred on context startup.
+   * The method returns null if the start was successful.
+   *
+   *
+   * @return startup exception of null
+   * @since 1.14
+   */
+  public Throwable getStartupError();
+
   /**
    * Returns the version of the SCM-Manager.
    *