workflowcheck - initial support for Java static analyzer

settings.gradle

@@ -9,4 +9,5 @@ include 'temporal-kotlin'
 include 'temporal-spring-boot-autoconfigure'
 include 'temporal-spring-boot-starter'
 include 'temporal-remote-data-encoder'
-include 'temporal-shaded'
+include 'temporal-shaded'
+include 'temporal-workflowcheck'

temporal-workflowcheck/build.gradle

@@ -0,0 +1,44 @@
+plugins {
+    id 'application'
+    id 'com.gradleup.shadow' version '8.3.3'
+}
+
+description = 'Temporal Java WorkflowCheck Static Analyzer'
+
+dependencies {
+    implementation 'org.ow2.asm:asm:9.6'
+    compileOnly 'com.google.code.findbugs:jsr305:3.0.2'
+    testImplementation project(":temporal-sdk")
+    testImplementation "junit:junit:${junitVersion}"
+    // Only for testing external-JAR-based bad calls
+    testImplementation "com.google.guava:guava:$guavaVersion"
+}
+
+application {
+    mainClass = 'io.temporal.workflowcheck.Main'
+}
+
+// Need all-in-one JAR
+shadowJar {
+    relocate 'org.objectweb.asm', 'io.temporal.workflowcheck.shaded.org.objectweb.asm'
+}
+build.dependsOn shadowJar
+
+// Access Java test source as resource
+tasks.register('copyJavaSourcesToResources') {
+    doLast {
+        copy {
+            from('src/test/java') {
+                include '**/*.*'
+            }
+            into 'build/resources/test'
+        }
+    }
+}
+processTestResources.dependsOn copyJavaSourcesToResources
+
+spotless {
+    java {
+        toggleOffOn()
+    }
+}

temporal-workflowcheck/samples/.gitignore

@@ -0,0 +1,3 @@
+gradle/build
+gradle-multi-project/project-app/build
+gradle-multi-project/project-workflows/build

temporal-workflowcheck/samples/gradle-multi-project/README.md

@@ -0,0 +1,18 @@
+# Temporal Workflow Check for Java - Gradle Sample
+
+This sample shows how to incorporate `workflowcheck` into a Gradle build that has multiple projects. Currently there are
+no published releases, so this example includes the primary build in the [settings.gradle](settings.gradle) file. But
+users may just want to reference a published JAR when it is available.
+
+To run:
+
+    gradlew check
+
+This will output something like:
+
+```
+Analyzing classpath for classes with workflow methods...
+Found 1 class(es) with workflow methods
+Workflow method io.temporal.workflowcheck.sample.gradlemulti.workflows.MyWorkflowImpl.errorAtNight() (declared on io.temporal.workflowcheck.sample.gradlemulti.workflows.MyWorkflow) has 1 invalid member access:
+  MyWorkflowImpl.java:10 invokes java.time.LocalTime.now() which is configured as invalid
+```

temporal-workflowcheck/samples/gradle-multi-project/build.gradle

@@ -0,0 +1,9 @@
+plugins {
+    id 'java'
+}
+
+allprojects {
+    repositories {
+        mavenCentral()
+    }
+}

temporal-workflowcheck/samples/gradle-multi-project/gradle/wrapper/gradle-wrapper.properties

@@ -0,0 +1,6 @@
+#Sun Dec 24 20:45:25 CST 2023
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.4-bin.zip
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists