chore: add linting to workflow

.github/workflows/ci.yml

@@ -36,6 +36,25 @@ jobs:
           echo "$sha  $fileName" > sha256.txt
           sha256sum -c sha256.txt
 
+      - uses: pmd/pmd-github-action@v2
+        name: Lint
+        id: pmd
+        if: ${{ matrix.os == 'ubuntu-latest' }}
+        with:
+            rulesets: 'plugin/src/main/resources/pmd-ruleset.xml'
+            sourcePath: 'plugin/src/main/java'
+            analyzeModifiedFilesOnly: true
+
+      - name: Upload SARIF file
+        if: ${{ matrix.os == 'ubuntu-latest' && steps.pmd.outputs.violations != 0 }}
+        uses: github/codeql-action/upload-sarif@v3
+        with:
+            sarif_file: pmd-report.sarif
+
+      - name: Fail build if violations found
+        if: steps.pmd.outputs.violations != 0
+        run: exit 1
+
       - name: Build with Maven
         if: ${{ github.event_name == 'push' && github.ref == 'refs/heads/main' && matrix.os == 'ubuntu-latest' }}
         run: ./mvnw clean verify -P sign -DtrimStackTrace=false

.project

@@ -35,12 +35,18 @@
 			<arguments>
 			</arguments>
 		</buildCommand>
+		<buildCommand>
+			<name>net.sourceforge.pmd.eclipse.plugin.pmdBuilder</name>
+			<arguments>
+			</arguments>
+		</buildCommand>
 	</buildSpec>
 	<natures>
 		<nature>org.eclipse.m2e.core.maven2Nature</nature>
 		<nature>org.eclipse.pde.PluginNature</nature>
 		<nature>org.eclipse.jdt.core.javanature</nature>
 		<nature>org.eclipse.pde.FeatureNature</nature>
 		<nature>org.eclipse.pde.UpdateSiteNature</nature>
+		<nature>net.sourceforge.pmd.eclipse.plugin.pmdNature</nature>
 	</natures>
 </projectDescription>

feature/pom.xml

@@ -1,45 +1,48 @@
 <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 http://maven.apache.org/xsd/maven-4.0.0.xsd">
-  <modelVersion>4.0.0</modelVersion>
-  <parent>
-    <groupId>io.snyk</groupId>
-    <artifactId>parent</artifactId>
-    <version>3.0.0-SNAPSHOT</version>
-  </parent>
+    <modelVersion>4.0.0</modelVersion>
+    <parent>
+        <groupId>io.snyk</groupId>
+        <artifactId>parent</artifactId>
+        <version>3.0.0-SNAPSHOT</version>
+    </parent>
 
-  <artifactId>io.snyk.scanner</artifactId>
+    <artifactId>io.snyk.scanner</artifactId>
+    <properties>
+        <pmdRuleDir>${project.parent.basedir}</pmdRuleDir>
+    </properties>
 
-  <packaging>eclipse-feature</packaging>
+    <packaging>eclipse-feature</packaging>
 
-  <build>
-    <plugins>
-      <plugin>
-        <groupId>org.eclipse.tycho</groupId>
-        <artifactId>tycho-source-plugin</artifactId>
-        <version>${tycho-version}</version>
-        <executions>
-          <execution>
-            <id>feature-source</id>
-            <phase>package</phase>
-            <goals>
-              <goal>feature-source</goal>
-            </goals>
-          </execution>
-        </executions>
-      </plugin>
-      <plugin>
-        <groupId>org.eclipse.tycho</groupId>
-        <artifactId>tycho-p2-plugin</artifactId>
-        <executions>
-          <execution>
-            <id>attach-p2-metadata</id>
-            <phase>package</phase>
-            <goals>
-              <goal>p2-metadata</goal>
-            </goals>
-          </execution>
-        </executions>
-      </plugin>
-    </plugins>
-  </build>
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.eclipse.tycho</groupId>
+                <artifactId>tycho-source-plugin</artifactId>
+                <version>${tycho-version}</version>
+                <executions>
+                    <execution>
+                        <id>feature-source</id>
+                        <phase>package</phase>
+                        <goals>
+                            <goal>feature-source</goal>
+                        </goals>
+                    </execution>
+                </executions>
+            </plugin>
+            <plugin>
+                <groupId>org.eclipse.tycho</groupId>
+                <artifactId>tycho-p2-plugin</artifactId>
+                <executions>
+                    <execution>
+                        <id>attach-p2-metadata</id>
+                        <phase>package</phase>
+                        <goals>
+                            <goal>p2-metadata</goal>
+                        </goals>
+                    </execution>
+                </executions>
+            </plugin>
+        </plugins>
+    </build>
 </project>

plugin/.project

@@ -25,10 +25,16 @@
 			<arguments>
 			</arguments>
 		</buildCommand>
+		<buildCommand>
+			<name>net.sourceforge.pmd.eclipse.plugin.pmdBuilder</name>
+			<arguments>
+			</arguments>
+		</buildCommand>
 	</buildSpec>
 	<natures>
 		<nature>org.eclipse.m2e.core.maven2Nature</nature>
 		<nature>org.eclipse.pde.PluginNature</nature>
 		<nature>org.eclipse.jdt.core.javanature</nature>
+		<nature>net.sourceforge.pmd.eclipse.plugin.pmdNature</nature>
 	</natures>
 </projectDescription>

plugin/plugin.xml

@@ -20,9 +20,9 @@
     <extension point="org.eclipse.ui.perspectiveExtensions">
         <perspectiveExtension
             targetID="org.eclipse.jdt.ui.JavaPerspective">
-            <view 
-            	id="io.snyk.eclipse.plugin.views.snyktoolview" 
-            	ratio="0.5" 
+            <view
+            	id="io.snyk.eclipse.plugin.views.snyktoolview"
+            	ratio="0.5"
             	relative="org.eclipse.ui.views.ProblemView"
                 relationship="right">
             </view>
@@ -412,13 +412,13 @@
     </extension>
     <extension point="org.eclipse.lsp4e.languageServer">
         <server
-            class="io.snyk.languageserver.SnykLanguageServer"
-            id="io.snyk.languageserver"
-            label="Snyk Language Server"
-            clientImpl="io.snyk.languageserver.protocolextension.SnykExtendedLanguageClient"
-            lastDocumentDisconnectedTimeout="3000000"
-            singleton="true"
-            markerType="io.snyk.languageserver.marker">
+              class="io.snyk.languageserver.SnykLanguageServer"
+              clientImpl="io.snyk.languageserver.protocolextension.SnykExtendedLanguageClient"
+              id="io.snyk.languageserver"
+              label="Snyk Language Server"
+              lastDocumentDisconnectedTimeout="3000000"
+              markerType="io.snyk.languageserver.marker"
+              singleton="true">
         </server>
         <!-- snyk code -->
         <contentTypeMapping