Java compilation warnings and errors are no longer limited to the first 100

changelog/@unreleased/pr-1890.v2.yml

@@ -0,0 +1,6 @@
+type: improvement
+improvement:
+  description: Java compilation warnings and errors are no longer limited to the first
+    100
+  links:
+  - https://github.com/palantir/gradle-baseline/pull/1890

gradle-baseline-java/src/main/groovy/com/palantir/baseline/plugins/Baseline.java

@@ -57,6 +57,7 @@ public void apply(Project project) {
             proj.getPluginManager().apply(BaselineReleaseCompatibility.class);
             proj.getPluginManager().apply(BaselineTesting.class);
             proj.getPluginManager().apply(BaselineTestHeap.class);
+            proj.getPluginManager().apply(BaselineJavaCompilerDiagnostics.class);
             proj.getPluginManager().apply(BaselineJavaParameters.class);
             proj.getPluginManager().apply(BaselineImmutables.class);
         });

gradle-baseline-java/src/main/groovy/com/palantir/baseline/plugins/BaselineJavaCompilerDiagnostics.java

@@ -0,0 +1,53 @@
+/*
+ * (c) Copyright 2019 Palantir Technologies Inc. All rights reserved.
+ *
+ * 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
+ *
+ *     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.
+ */
+
+package com.palantir.baseline.plugins;
+
+import java.util.List;
+import org.gradle.api.Plugin;
+import org.gradle.api.Project;
+import org.gradle.api.tasks.compile.JavaCompile;
+
+/**
+ * Applies the {@code -Xmaxwarns} and {@code -Xmaxerrs} compiler options with a very large
+ * limit to avoid truncating failure info.
+ */
+public final class BaselineJavaCompilerDiagnostics implements Plugin<Project> {
+
+    // Default maxwarns/maxerrs is only 100, which often makes it difficult to debug
+    // annotation processing issues.
+    private static final String MANY = "10000";
+
+    private static final String MAX_WARNINGS_ARG = "-Xmaxwarns";
+    private static final String MAX_ERRORS_ARG = "-Xmaxerrs";
+
+    @Override
+    public void apply(Project proj) {
+        proj.afterEvaluate(
+                project -> project.getTasks().withType(JavaCompile.class).configureEach(javaCompileTask -> {
+                    List<String> compilerArgs = javaCompileTask.getOptions().getCompilerArgs();
+                    // Avoid overriding options that have already been set
+                    if (!compilerArgs.contains(MAX_WARNINGS_ARG)) {
+                        compilerArgs.add(MAX_WARNINGS_ARG);
+                        compilerArgs.add(MANY);
+                    }
+                    if (!compilerArgs.contains(MAX_ERRORS_ARG)) {
+                        compilerArgs.add(MAX_ERRORS_ARG);
+                        compilerArgs.add(MANY);
+                    }
+                }));
+    }
+}

gradle-baseline-java/src/main/resources/META-INF/gradle-plugins/com.palantir.baseline-java-compiler-diagnostics.properties

@@ -0,0 +1 @@
+implementation-class=com.palantir.baseline.plugins.BaselineJavaCompilerDiagnostics

gradle-baseline-java/src/test/groovy/com/palantir/baseline/BaselineJavaCompilerDiagnosticsTest.groovy

@@ -0,0 +1,72 @@
+/*
+ * (c) Copyright 2018 Palantir Technologies Inc. All rights reserved.
+ *
+ * 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
+ *
+ *     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.
+ */
+
+package com.palantir.baseline
+
+import com.palantir.baseline.plugins.BaselineJavaCompilerDiagnostics
+import org.gradle.api.tasks.compile.JavaCompile
+import org.gradle.testfixtures.ProjectBuilder
+import spock.lang.Specification
+
+class BaselineJavaCompilerDiagnosticsTest extends Specification {
+
+    def testDefault() {
+        when:
+        def project = ProjectBuilder.builder().build()
+        project.buildscript {
+            repositories {
+                mavenCentral()
+            }
+        }
+        project.plugins.apply 'java'
+        project.plugins.apply BaselineJavaCompilerDiagnostics
+        project.evaluate()
+
+        then:
+        JavaCompile compileTask = project.tasks.getByName('compileJava').asType(JavaCompile.class)
+        List<String> allJvmArgs = compileTask.allJvmArgs
+        allJvmArgs.stream().filter('-Xmaxerrs'::equals).count() == 1
+        allJvmArgs.get(allJvmArgs.indexOf('-Xmaxerrs') + 1) == '1000'
+        allJvmArgs.stream().filter('-Xmaxwarns'::equals).count() == 1
+        allJvmArgs.get(allJvmArgs.indexOf('-Xmaxerrs') + 1) == '1000'
+    }
+
+    def testOverridden() {
+        when:
+        def project = ProjectBuilder.builder().build()
+        project.buildscript {
+            repositories {
+                mavenCentral()
+            }
+        }
+        project.plugins.apply 'java'
+        tasks.withType(JavaCompile) {
+            options.compilerArgs += [
+                    '-Xmaxerrs', '1000'
+            ]
+        }
+        project.plugins.apply BaselineJavaCompilerDiagnostics
+        project.evaluate()
+
+        then:
+        project.tasks.type
+        JavaCompile compileTask = project.tasks.getByName('compileJava').asType(JavaCompile.class)
+        List<String> allJvmArgs = compileTask.allJvmArgs
+        allJvmArgs.stream().filter('-Xmaxerrs'::equals).count() == 1
+        allJvmArgs.get(allJvmArgs.indexOf("-Xmaxerrs") + 1) == '1000'
+        allJvmArgs.stream().filter('-Xmaxwarns'::equals).count() == 1
+    }
+}