fix: shim installation in ci, shim failure message

Signed-off-by: Sam Gammon <[email protected]>

Author: sgammon

.github/workflows/job.build.yml

@@ -56,6 +56,8 @@ jobs:
         run: cd ./example-project && elide install
       - name: "Setup: Dependencies (Remote Example)"
         run: cd ./example-project-remote && elide install
+      - name: "Setup: Gradle Java Compiler Shim"
+        run: cp -fv ./.github/workflows/shim.sh $JAVA_HOME/bin/elide-javac && chmod +x $JAVA_HOME/bin/elide-javac
       - name: "Build: Projects"
         run: ./gradlew --stacktrace --info --no-daemon build
       - name: "Build: Remote Example"

.github/workflows/shim.sh

@@ -0,0 +1,2 @@
+#!/usr/bin/env bash
+exec elide javac -- "$@"

README.md

@@ -8,7 +8,7 @@ Experimental plugin for using [Elide](https://github.com/elide-dev/elide) from w
 
    **`$JAVA_HOME/bin/elide-javac`**
     ```bash
-    #!env bash
+    #!/usr/bin/env bash
     exec elide javac -- "${@}"
     ```
 

elide-gradle-plugin/src/main/java/dev/elide/gradle/ElideGradlePlugin.java

@@ -81,6 +81,10 @@ private Task configureJavaCompileToUseElide(Project project, JavaCompile task, E
             // the shim is there and executable, so we can use it.
             resolvedElide = javaHomeShim;
         }
+        if (resolvedElide == null) {
+            project.getLogger().error("Failed to resolve Elide javac shim, and Java Home is not writable.");
+            throw new RuntimeException("Failed to resolve Elide javac shim; is your Java Home writable?");
+        }
         Objects.requireNonNull(resolvedElide);
         var pathAsString = resolvedElide.toString();
         var options = task.getOptions();