CheckMojo: introduce failThreshold

src/it/check-fail/verify.groovy

@@ -0,0 +1,18 @@
+/*
+ * Copyright (C) 2006-2020 the original author or authors.
+ *
+ * Licensed 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
+ *
+ *     https://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.
+ */
+
+File buildLog = new File( basedir, 'build.log' )
+assert buildLog.text.contains( '[ERROR] High: Found reliance on default encoding in UserMistakes' ) 

src/it/check-failThreshold/invoker.properties

@@ -0,0 +1,4 @@
+invoker.goals = clean compile spotbugs:check
+
+# The expected result of the build, possible values are "success" (default) and "failure"
+invoker.buildResult = failure

src/it/check-failThreshold/pom.xml

@@ -0,0 +1,44 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+    Copyright (C) 2006-2020 the original author or authors.
+
+    Licensed 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
+
+        https://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 xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
+  <modelVersion>4.0.0</modelVersion>
+  <parent>
+    <groupId>spotbugs-maven-plugin.it</groupId>
+    <artifactId>common</artifactId>
+    <version>testing</version>
+    <relativePath>../common.xml</relativePath>
+  </parent>
+  <artifactId>check</artifactId>
+  <name>check</name>
+  <packaging>jar</packaging>
+  <build>
+    <plugins>
+      <plugin>
+        <groupId>com.github.spotbugs</groupId>
+        <artifactId>spotbugs-maven-plugin</artifactId>
+        <configuration>
+          <xmlOutput>true</xmlOutput>
+          <failOnError>true</failOnError>
+          <debug>@spotbugsTestDebug@</debug>
+          <failThreshold>High</failThreshold>
+        </configuration>
+      </plugin>
+    </plugins>
+  </build>
+</project>

src/it/check-failThreshold/verify.groovy

@@ -0,0 +1,19 @@
+/*
+ * Copyright (C) 2006-2020 the original author or authors.
+ *
+ * Licensed 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
+ *
+ *     https://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.
+ */
+
+File buildLog = new File( basedir, 'build.log' )
+assert buildLog.text.contains( '[WARNING] Medium: Unused public or protected field:' )
+assert buildLog.text.contains( '[ERROR] High: Found reliance on default encoding in UserMistakes' )

src/main/groovy/org/codehaus/mojo/spotbugs/SpotbugsViolationCheckMojo.groovy

@@ -428,6 +428,15 @@ class SpotbugsViolationCheckMojo extends AbstractMojo {
     @Parameter(property = "spotbugs.failOnError", defaultValue = "true")
     boolean failOnError
 
+    /**
+     * Prioritiy threshold which bugs have to reach to cause a failure. Valid values are High, Medium or Low.
+     * Bugs below this threshold will just issue a warning log entry.
+     *
+     * @since 4.0.1
+     */
+    @Parameter(property = "spotbugs.failThreshold")
+    String failThreshold
+
     /**
      * Fork a VM for Spotbugs analysis.  This will allow you to set timeouts and heap size.
      *
@@ -522,15 +531,31 @@ class SpotbugsViolationCheckMojo extends AbstractMojo {
                 }
 
                 log.info('Total bugs: ' + bugCount)
+                def bugCountAboveThreshold = 0
+                def priorityThresholdNum = failThreshold ? SpotBugsInfo.spotbugsPriority.indexOf(failThreshold) : Integer.MAX_VALUE
+                if (priorityThresholdNum == -1) {
+                    throw new MojoExecutionException("Invalid value for failThreshold: ${failThreshold}")
+                }
+
                 for (i in 0..bugCount-1) {
                     def bug = bugs[i]
-                    log.error( bug.LongMessage.text() + SpotBugsInfo.BLANK + bug.SourceLine.'@classname' + SpotBugsInfo.BLANK + bug.SourceLine.Message.text() + SpotBugsInfo.BLANK + bug.'@type')
+                    def priorityNum = bug.'@priority' as int
+                    def priorityName = SpotBugsInfo.spotbugsPriority[priorityNum]
+                    def logMsg = priorityName + ': ' + bug.LongMessage.text() + SpotBugsInfo.BLANK + bug.SourceLine.'@classname' + SpotBugsInfo.BLANK +
+                            bug.SourceLine.Message.text() + SpotBugsInfo.BLANK + bug.'@type'
+
+                    if (priorityNum <= priorityThresholdNum) {  // lower is more severe
+                        bugCountAboveThreshold += 1
+                        log.error(logMsg)
+                    } else {
+                        log.warn(logMsg)
+                    }
                 }
 
                 log.info('\n\n\nTo see bug detail using the Spotbugs GUI, use the following command "mvn spotbugs:gui"\n\n\n')
 
-                if ( (bugCount || errorCount) && failOnError ) {
-                    throw new MojoExecutionException("failed with ${bugCount} bugs and ${errorCount} errors ")
+                if ( (bugCountAboveThreshold || errorCount) && failOnError ) {
+                    throw new MojoExecutionException("failed with ${bugCountAboveThreshold} bugs and ${errorCount} errors ")
                 }
             }
         }