[Fix-17710][Master] Fix master task dispatch failure by filtering out null map keys.

dolphinscheduler-master/src/test/java/org/apache/dolphinscheduler/server/master/integration/cases/WorkflowStartTestCase.java

@@ -775,6 +775,50 @@
         masterContainer.assertAllResourceReleased();
     }
 
+    @Test
+    @DisplayName("Test start a workflow which using null key params")
+    public void testStartWorkflow_usingNullKeyParam() {
+        final String yaml = "/it/start/workflow_with_null_key_param.yaml";
+        final WorkflowTestCaseContext context = workflowTestCaseContextFactory.initializeContextFromYaml(yaml);
+        final WorkflowDefinition workflow = context.getOneWorkflow();
+
+        final RunWorkflowCommandParam runWorkflowCommandParam = RunWorkflowCommandParam.builder()
+                .commandParams(Lists.newArrayList(Property.builder()
+                        .prop(null)
+                        .direct(Direct.IN)
+                        .type(DataType.VARCHAR)
+                        .value("commandParam")
+                        .build()))
+                .build();
+
+        final WorkflowOperator.WorkflowTriggerDTO workflowTriggerDTO = WorkflowOperator.WorkflowTriggerDTO.builder()
+                .workflowDefinition(workflow)
+                .runWorkflowCommandParam(runWorkflowCommandParam)
+                .build();
+        workflowOperator.manualTriggerWorkflow(workflowTriggerDTO);
+
+        await()
+                .atMost(Duration.ofMinutes(1))
+                .untilAsserted(() -> {
+                    Assertions
+                            .assertThat(repository.queryWorkflowInstance(workflow))
+                            .satisfiesExactly(workflowInstance -> assertThat(workflowInstance.getState())
+                                    .isEqualTo(WorkflowExecutionStatus.SUCCESS));
+                    Assertions
+                            .assertThat(repository.queryTaskInstance(workflow))
+                            .hasSize(2)
+                            .anySatisfy(taskInstance -> {
+                                assertThat(taskInstance.getName()).isEqualTo("A");
+                                assertThat(taskInstance.getState()).isEqualTo(TaskExecutionStatus.SUCCESS);
+                            })
+                            .anySatisfy(taskInstance -> {
+                                assertThat(taskInstance.getName()).isEqualTo("B");
+                                assertThat(taskInstance.getState()).isEqualTo(TaskExecutionStatus.SUCCESS);
+                            });
+                });
+        masterContainer.assertAllResourceReleased();
+    }
+
     @Test
     @DisplayName("Test start a workflow with one fake task(A) failed")
     public void testStartWorkflow_with_oneFailedTask() {

dolphinscheduler-master/src/test/resources/it/start/workflow_with_null_key_param.yaml

@@ -0,0 +1,108 @@
+#
+# Licensed to the Apache Software Foundation (ASF) under one or more
+# contributor license agreements.  See the NOTICE file distributed with
+# this work for additional information regarding copyright ownership.
+# The ASF licenses this file to You under the Apache License, Version 2.0
+# (the "License"); you may not use this file except in compliance with
+# the License.  You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+project:
+  name: MasterIntegrationTest
+  code: 1
+  description: This is a fake project
+  userId: 1
+  userName: admin
+  createTime: 2024-08-12 00:00:00
+  updateTime: 2024-08-12 00:00:00
+
+workflows:
+  - name: workflow_with_one_fake_task_success
+    code: 1
+    version: 1
+    projectCode: 1
+    description: This is a fake workflow with single task
+    releaseState: ONLINE
+    createTime: 2024-08-12 00:00:00
+    updateTime: 2024-08-12 00:00:00
+    userId: 1
+    globalParams: '[{"prop":null,"value":"workflowParam","direct":"IN","type":"VARCHAR"}]'
+    executionType: PARALLEL
+
+tasks:
+  - name: A
+    code: 1
+    version: 1
+    projectCode: 1
+    userId: 1
+    taskType: LogicFakeTask
+    taskParams: >
+      {
+        "localParams": [
+          {
+            "prop": "",
+            "direct": "IN",
+            "type": "VARCHAR",
+            "value": ""
+          }
+        ],
+        "shellScript": "echo 111",
+        "resourceList": []
+      }
+    workerGroup: default
+    createTime: 2024-08-12 00:00:00
+    updateTime: 2024-08-12 00:00:00
+    taskExecuteType: BATCH
+  - name: B
+    code: 2
+    version: 1
+    projectCode: 1
+    userId: 1
+    taskType: LogicFakeTask
+    taskParams: >
+      {
+        "localParams": [
+          {
+            "prop": null,
+            "direct": "IN",
+            "type": "VARCHAR",
+            "value": ""
+          }
+        ],
+        "shellScript": "echo 111",
+        "resourceList": []
+      }
+    workerGroup: default
+    createTime: 2024-08-12 00:00:00
+    updateTime: 2024-08-12 00:00:00
+    taskExecuteType: BATCH
+
+
+
+taskRelations:
+  - projectCode: 1
+    workflowDefinitionCode: 1
+    workflowDefinitionVersion: 1
+    preTaskCode: 0
+    preTaskVersion: 0
+    postTaskCode: 1
+    postTaskVersion: 1
+    createTime: 2024-08-12 00:00:00
+    updateTime: 2024-08-12 00:00:00
+  - projectCode: 1
+    workflowDefinitionCode: 1
+    workflowDefinitionVersion: 1
+    preTaskCode: 0
+    preTaskVersion: 0
+    postTaskCode: 2
+    postTaskVersion: 1
+    createTime: 2024-08-12 00:00:00
+    updateTime: 2024-08-12 00:00:00

dolphinscheduler-service/src/main/java/org/apache/dolphinscheduler/service/expand/CuringParamsServiceImpl.java

@@ -48,14 +48,14 @@
 import org.apache.dolphinscheduler.plugin.task.api.utils.ParameterUtils;
 import org.apache.dolphinscheduler.plugin.task.api.utils.PropertyUtils;
 import org.apache.dolphinscheduler.plugin.task.api.utils.VarPoolUtils;
+import org.apache.dolphinscheduler.service.exceptions.ServiceException;
 
 import org.apache.commons.collections4.CollectionUtils;
 import org.apache.commons.lang3.StringUtils;
 
 import java.util.Collections;
 import java.util.Date;
 import java.util.HashMap;
-import java.util.Iterator;
 import java.util.LinkedHashMap;
 import java.util.List;
 import java.util.Map;
@@ -66,10 +66,12 @@
 import javax.annotation.Nullable;
 
 import lombok.NonNull;
+import lombok.extern.slf4j.Slf4j;
 
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.stereotype.Component;
 
+@Slf4j
 @Component
 public class CuringParamsServiceImpl implements CuringParamsService {
 
@@ -160,7 +162,13 @@ public Map<String, Property> parseWorkflowFatherParam(@Nullable Map<String, Stri
     }
 
     /**
-     * Generate prepare params include project params, global parameters, local parameters, built-in parameters, varpool, start-up params.
+     * Prepares the final map of task execution parameters by merging parameters from multiple sources
+     * in a well-defined priority order. The resulting map is guaranteed to contain only valid entries:
+     * <ul>
+     *   <li>Keys are non-null and non-blank strings</li>
+     *   <li>Values are non-null {@link Property} objects</li>
+     * </ul>
+     *
      * <p> The priority of the parameters is as follows:
      * <p> varpool > command parameters > local parameters > global parameters > project parameters > built-in parameters
      * todo: Use TaskRuntimeParams to represent this.
@@ -180,87 +188,101 @@ public Map<String, Property> paramParsingPreparation(@NonNull TaskInstance taskI
                                                          String workflowDefinitionName) {
         Map<String, Property> prepareParamsMap = new HashMap<>();
 
-        // assign value to definedParams here
-        Map<String, Property> globalParams = parseGlobalParamsMap(workflowInstance);
-
-        // combining local and global parameters
-        Map<String, Property> localParams = parameters.getInputLocalParametersMap();
-
-        // stream pass params
-        List<Property> varPools = parseVarPool(taskInstance);
-
-        // if it is a complement,
-        // you need to pass in the task instance id to locate the time
-        // of the process instance complement
+        // If it is a complement, you need to pass in the task instance id
+        // to locate the time of the process instance complement.
         ICommandParam commandParam = JSONUtils.parseObject(workflowInstance.getCommandParam(), ICommandParam.class);
+        if (commandParam == null) {
+            throw new ServiceException(String.format("Failed to parse command parameter for workflow instance %s",
+                    workflowInstance.getId()));
+        }
         String timeZone = commandParam.getTimeZone();
 
-        // built-in params
-        Map<String, String> builtInParams =
-                setBuiltInParamsMap(taskInstance, workflowInstance, timeZone, projectName, workflowDefinitionName);
+        // 1. Built-in parameters (lowest precedence)
+        Map<String, String> builtInParams = setBuiltInParamsMap(
+                taskInstance, workflowInstance, timeZone, projectName, workflowDefinitionName);
+        safePutAll(prepareParamsMap, ParameterUtils.getUserDefParamsMap(builtInParams));
 
-        // project-level params
+        // 2. Project-level parameters
         Map<String, Property> projectParams = getProjectParameterMap(taskInstance.getProjectCode());
+        safePutAll(prepareParamsMap, projectParams);
 
-        if (MapUtils.isNotEmpty(builtInParams)) {
-            prepareParamsMap.putAll(ParameterUtils.getUserDefParamsMap(builtInParams));
-        }
-
-        if (MapUtils.isNotEmpty(projectParams)) {
-            prepareParamsMap.putAll(projectParams);
-        }
-
-        if (MapUtils.isNotEmpty(globalParams)) {
-            prepareParamsMap.putAll(globalParams);
-        }
+        // 3. Workflow global parameters
+        Map<String, Property> globalParams = parseGlobalParamsMap(workflowInstance);
+        safePutAll(prepareParamsMap, globalParams);
 
-        if (MapUtils.isNotEmpty(localParams)) {
-            prepareParamsMap.putAll(localParams);
-        }
+        // 4. Task-local parameters
+        Map<String, Property> localParams = parameters.getInputLocalParametersMap();
+        safePutAll(prepareParamsMap, localParams);
 
+        // 5. Command-line / complement parameters
         if (CollectionUtils.isNotEmpty(commandParam.getCommandParams())) {
-            prepareParamsMap.putAll(commandParam.getCommandParams().stream()
-                    .collect(Collectors.toMap(Property::getProp, Function.identity())));
+            Map<String, Property> commandParamsMap = commandParam.getCommandParams().stream()
+                    .filter(prop -> StringUtils.isNotBlank(prop.getProp()))
+                    .collect(Collectors.toMap(
+                            Property::getProp,
+                            Function.identity(),
+                            (v1, v2) -> v2 // retain last on duplicate key
+                    ));
+            safePutAll(prepareParamsMap, commandParamsMap);
         }
 
+        // 6. VarPool: override values only for existing IN-direction parameters
+        List<Property> varPools = parseVarPool(taskInstance);
         if (CollectionUtils.isNotEmpty(varPools)) {
-            // overwrite the in parameter by varPool
             for (Property varPool : varPools) {
-                Property property = prepareParamsMap.get(varPool.getProp());
-                if (property == null || property.getDirect() != Direct.IN) {
+                if (StringUtils.isBlank(varPool.getProp())) {
                     continue;
                 }
-                property.setValue(varPool.getValue());
+                Property targetParam = prepareParamsMap.get(varPool.getProp());
+                if (targetParam != null && Direct.IN.equals(targetParam.getDirect())) {
+                    targetParam.setValue(varPool.getValue());
+                }
             }
         }
 
-        Iterator<Map.Entry<String, Property>> iter = prepareParamsMap.entrySet().iterator();
-        while (iter.hasNext()) {
-            Map.Entry<String, Property> en = iter.next();
-            Property property = en.getValue();
-
-            if (StringUtils.isNotEmpty(property.getValue())
-                    && property.getValue().contains(Constants.FUNCTION_START_WITH)) {
-                /**
-                 *  local parameter refers to global parameter with the same name
-                 *  note: the global parameters of the process instance here are solidified parameters,
-                 *  and there are no variables in them.
-                 */
-                String val = property.getValue();
-
-                // handle some chain parameter assign, such as `{"var1": "${var2}", "var2": 1}` should be convert to
-                // `{"var1": 1, "var2": 1}`
-                val = convertParameterPlaceholders(val, prepareParamsMap);
-                property.setValue(val);
-            }
+        // 7. Inject business/scheduling parameters (e.g., ${datetime}), which may contain or reference placeholders
+        Map<String, Property> businessParams = preBuildBusinessParams(workflowInstance);
+        safePutAll(prepareParamsMap, businessParams);
+
+        // 8. Resolve all placeholders (e.g., "${output_dir}") using the current parameter context
+        resolvePlaceholders(prepareParamsMap);
+
+        return prepareParamsMap;
+    }
+
+    /**
+     * Safely merges entries from the {@code source} map into the {@code target} map,
+     * skipping any entry with a {@code null}, empty, or blank key, or a {@code null} value.
+     *
+     * @param target the destination map to merge into (must not be null)
+     * @param source the source map whose valid entries will be copied (may be null or empty)
+     */
+    private void safePutAll(Map<String, Property> target, Map<String, Property> source) {
+        if (MapUtils.isEmpty(source)) {
+            return;
         }
+        source.forEach((key, value) -> {
+            if (StringUtils.isNotBlank(key) && value != null) {
+                target.put(key, value);
+            } else {
+                log.warn("Skipped invalid parameter entry: key='{}', value={}", key, value);
+            }
+        });
+    }
 
-        // put schedule time param to params map
-        Map<String, Property> paramsMap = preBuildBusinessParams(workflowInstance);
-        if (MapUtils.isNotEmpty(paramsMap)) {
-            prepareParamsMap.putAll(paramsMap);
+    /**
+     * Resolves placeholder expressions (e.g., "${var}") in parameter values by substituting them
+     * with actual values from the current {@code paramsMap}.
+     *
+     * @param paramsMap the map of parameters (key: parameter name, value: {@link Property}) to resolve
+     */
+    private void resolvePlaceholders(Map<String, Property> paramsMap) {
+        for (Property prop : paramsMap.values()) {
+            String val = prop.getValue();
+            if (StringUtils.isNotEmpty(val) && val.contains(Constants.FUNCTION_START_WITH)) {
+                prop.setValue(convertParameterPlaceholders(val, paramsMap));
+            }
         }
-        return prepareParamsMap;
     }
 
     /**