Pass the whole exception to a wrapper exception, because e.getCause()…

… can be null. Adapt the 'Algorithm could not be loaded'-exception.

backend/src/main/java/de/metanome/backend/algorithm_execution/AlgorithmExecutor.java

@@ -96,19 +96,19 @@ public long executeAlgorithm(String algorithmFileName,
     try {
       return executeAlgorithmWithValues(algorithmFileName, parameterValues);
     } catch (IllegalArgumentException | SecurityException | IllegalAccessException e) {
-      throw new AlgorithmLoadingException("Could not load the algorithm.", e.getCause());
+      throw new AlgorithmLoadingException("Could not load the algorithm.", e);
     } catch (IOException e) {
-      throw new AlgorithmLoadingException("IO Exception", e.getCause());
+      throw new AlgorithmLoadingException("IO Exception", e);
     } catch (ClassNotFoundException e) {
-      throw new AlgorithmLoadingException("Class not found.", e.getCause());
+      throw new AlgorithmLoadingException("Class not found.", e);
     } catch (InstantiationException e) {
-      throw new AlgorithmLoadingException("Could not instantiate.", e.getCause());
+      throw new AlgorithmLoadingException("Could not instantiate.", e);
     } catch (InvocationTargetException e) {
-      throw new AlgorithmLoadingException("Could not invoke.", e.getCause());
+      throw new AlgorithmLoadingException("Could not invoke.", e);
     } catch (NoSuchMethodException e) {
-      throw new AlgorithmLoadingException("No such method.", e.getCause());
+      throw new AlgorithmLoadingException("No such method.", e);
     } catch (EntityStorageException e) {
-      throw new AlgorithmLoadingException("Algorithm not found in database.", e.getCause());
+      throw new AlgorithmLoadingException("Algorithm not found in database.", e);
     }
   }
 

backend/src/main/java/de/metanome/backend/input/sql/DefaultDatabaseConnectionGenerator.java

@@ -60,7 +60,7 @@ public DefaultDatabaseConnectionGenerator(String dbUrl, String userName, String
       this.dbConnection = DriverManager.getConnection(dbUrl, userName, password);
       this.dbConnection.setAutoCommit(false);
     } catch (SQLException e) {
-      throw new AlgorithmConfigurationException("Failed to get Database Connection.", e.getCause());
+      throw new AlgorithmConfigurationException("Failed to get Database Connection.", e);
     }
   }
 
@@ -79,7 +79,7 @@ public RelationalInput generateRelationalInputFromSql(String queryString)
     try {
       resultSetIterator = new ResultSetIterator(resultSet);
     } catch (SQLException e) {
-      throw new InputGenerationException("Could not construct sql input.", e.getCause());
+      throw new InputGenerationException("Could not construct sql input.", e);
     }
 
     return resultSetIterator;
@@ -98,13 +98,13 @@ protected ResultSet executeQuery(String queryString) throws InputGenerationExcep
       sqlStatement.setFetchSize(getFetchSize());
       statements.add(sqlStatement);
     } catch (SQLException e) {
-      throw new InputGenerationException("Could not create sql statement on connection.", e.getCause());
+      throw new InputGenerationException("Could not create sql statement on connection.", e);
     }
     ResultSet resultSet;
     try {
       resultSet = sqlStatement.executeQuery(queryString);
     } catch (SQLException e) {
-      throw new InputGenerationException("Could not execute sql statement.", e.getCause());
+      throw new InputGenerationException("Could not execute sql statement.", e);
     }
 
     return resultSet;

backend/src/main/java/de/metanome/backend/result_receiver/ResultPrinter.java

@@ -146,7 +146,7 @@ protected PrintStream openStream(String fileSuffix) throws CouldNotReceiveResult
     try {
       return new PrintStream(new FileOutputStream(getOutputFilePathPrefix() + fileSuffix), true);
     } catch (FileNotFoundException e) {
-      throw new CouldNotReceiveResultException("Could not open result file for writing.", e.getCause());
+      throw new CouldNotReceiveResultException("Could not open result file for writing.", e);
     }
   }
 

frontend/src/main/java/de/metanome/frontend/client/helpers/InputValidationException.java

@@ -30,4 +30,8 @@ public InputValidationException() {
   public InputValidationException(String message) {
     super(message);
   }
+
+  public InputValidationException(String message, Throwable cause) {
+    super(message, cause);
+  }
 }

frontend/src/main/java/de/metanome/frontend/client/input_fields/IntegerInput.java

@@ -54,7 +54,7 @@ public int getValue() throws InputValidationException {
     try {
       val = this.textbox.getValueOrThrow();
     } catch (ParseException e) {
-      throw new InputValidationException("Only numbers are allowed!");
+      throw new InputValidationException("Only numbers are allowed!", e);
     }
     if (val == null) {
       throw new InputValidationException("You have to enter a number!");

frontend/src/main/java/de/metanome/frontend/server/AlgorithmServiceImpl.java

@@ -122,7 +122,7 @@ public Algorithm addAlgorithm(Algorithm algorithm)
     try {
       analyzer = new AlgorithmAnalyzer(algorithm.getFileName());
     } catch (Exception e) {
-      throw new AlgorithmLoadingException("Algorithm could not be loaded!", e.getCause());
+      throw new AlgorithmLoadingException("The jar of the algorithm could not be loaded! (" + e.toString() + ")", e);
     }
 
     algorithm.setFd(analyzer.isFunctionalDependencyAlgorithm());

frontend/src/main/java/de/metanome/frontend/server/ExecutionServiceImpl.java

@@ -86,15 +86,15 @@ public long executeAlgorithm(String algorithmFileName, String executionIdentifie
     try {
       executor = buildExecutor(executionIdentifier);
     } catch (FileNotFoundException e) {
-      throw new AlgorithmExecutionException("Could not generate result file.", e.getCause());
+      throw new AlgorithmExecutionException("Could not generate result file.", e);
     } catch (UnsupportedEncodingException e) {
-      throw new AlgorithmExecutionException("Could not build temporary file generator.", e.getCause());
+      throw new AlgorithmExecutionException("Could not build temporary file generator.", e);
     }
     long executionTime = executor.executeAlgorithm(algorithmFileName, parameters);
     try {
       executor.close();
     } catch (IOException e) {
-      throw new AlgorithmExecutionException("Could not close algorithm executor.", e.getCause());
+      throw new AlgorithmExecutionException("Could not close algorithm executor.", e);
     }
 
     return executionTime;

frontend/src/main/java/de/metanome/frontend/server/ParameterServiceImpl.java

@@ -50,7 +50,7 @@ public List<ConfigurationRequirement> retrieveParameters(String algorithmFileNam
     try {
       algorithm = jarLoader.loadAlgorithm(algorithmFileName);
     } catch (Exception e) {
-      throw new AlgorithmExecutionException(e.getMessage(), e.getCause());
+      throw new AlgorithmExecutionException(e.getMessage(), e);
     }
 
     List<ConfigurationRequirement> configList = algorithm.getConfigurationRequirements();