Fix ExternalProvider on JDT (#778)

* Fix ExternalProvider on JDT

turns out getDirectives throws an NPE if it's an automatic module. Only happens with JDT though

* Update pom.xml

* Update ExternalProvider.java

Author: SentryMan

inject-generator/pom.xml

@@ -55,7 +55,7 @@
       <version>1.5</version>
       <scope>test</scope>
     </dependency>
-    
+
     <dependency>
       <groupId>io.avaje</groupId>
       <artifactId>avaje-http-client</artifactId>

inject-generator/src/main/java/io/avaje/inject/generator/ExternalProvider.java

@@ -24,6 +24,7 @@
 import javax.lang.model.element.ElementKind;
 import javax.lang.model.element.Modifier;
 import javax.lang.model.element.ModuleElement;
+import javax.lang.model.element.ModuleElement.ProvidesDirective;
 import javax.lang.model.element.TypeElement;
 import javax.lang.model.util.ElementFilter;
 
@@ -318,13 +319,22 @@ private static Stream<TypeElement> injectExtensions() {
 
     final var checkDirectives =
       allModules.stream()
-        .flatMap(m -> ElementFilter.providesIn(m.getDirectives()).stream())
+        .flatMap(ExternalProvider::providesDirectives)
         .filter(ExternalProvider::isInjectExtension)
         .flatMap(p -> p.getImplementations().stream());
 
     return Stream.concat(checkEnclosing, checkDirectives);
   }
 
+  // Automatic modules throw an NPE for getDirectives on JDT
+  private static Stream<ProvidesDirective> providesDirectives(ModuleElement m) {
+    try {
+      return ElementFilter.providesIn(m.getDirectives()).stream();
+    } catch (NullPointerException npe) {
+      return Stream.of();
+    }
+  }
+
   // when a project's module-info is misconfigured a certain way, getEnclosedElements throws an error
   private static Stream<? extends Element> getEnclosed(Element e) {
     try {