use an annotation processor instead of a groovy script because of classloading issues

src/main/java/com/commafeed/frontend/APIGenerator.java

@@ -0,0 +1,96 @@
+package com.commafeed.frontend;
+
+import java.io.File;
+import java.util.Set;
+
+import javax.annotation.processing.AbstractProcessor;
+import javax.annotation.processing.RoundEnvironment;
+import javax.annotation.processing.SupportedAnnotationTypes;
+import javax.annotation.processing.SupportedOptions;
+import javax.lang.model.element.Element;
+import javax.lang.model.element.TypeElement;
+import javax.tools.Diagnostic.Kind;
+import javax.tools.FileObject;
+import javax.tools.StandardLocation;
+
+import org.apache.commons.io.FileUtils;
+import org.apache.commons.lang.StringUtils;
+
+import com.commafeed.frontend.model.Entries;
+import com.commafeed.frontend.model.request.MarkRequest;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import com.wordnik.swagger.annotations.Api;
+import com.wordnik.swagger.core.Documentation;
+import com.wordnik.swagger.core.DocumentationEndPoint;
+import com.wordnik.swagger.core.SwaggerSpec;
+import com.wordnik.swagger.core.util.TypeUtil;
+import com.wordnik.swagger.jaxrs.HelpApi;
+import com.wordnik.swagger.jaxrs.JaxrsApiReader;
+
+@SupportedAnnotationTypes("com.wordnik.swagger.annotations.Api")
+@SupportedOptions("outputDirectory")
+public class APIGenerator extends AbstractProcessor {
+
+	@Override
+	public boolean process(Set<? extends TypeElement> annotations, RoundEnvironment roundEnv) {
+		try {
+			return processInternal(annotations, roundEnv);
+		} catch (Exception e) {
+			e.printStackTrace();
+			processingEnv.getMessager().printMessage(Kind.ERROR, e.getMessage());
+		}
+		return false;
+	}
+
+	private boolean processInternal(Set<? extends TypeElement> annotations, RoundEnvironment roundEnv) throws Exception {
+		JaxrsApiReader.setFormatString("");
+		TypeUtil.addAllowablePackage(Entries.class.getPackage().getName());
+		TypeUtil.addAllowablePackage(MarkRequest.class.getPackage().getName());
+
+		String apiVersion = "1.0";
+		String swaggerVersion = SwaggerSpec.version();
+		String basePath = "../rest";
+
+		Documentation doc = new Documentation();
+		for (Element element : roundEnv.getElementsAnnotatedWith(Api.class)) {
+			TypeElement type = (TypeElement) element;
+			String fqn = type.getQualifiedName().toString();
+			Class<?> resource = Class.forName(fqn);
+
+			Api api = resource.getAnnotation(Api.class);
+			String apiPath = api.value();
+
+			Documentation apiDoc = JaxrsApiReader.read(resource, apiVersion, swaggerVersion, basePath, apiPath);
+			apiDoc = new HelpApi(null).filterDocs(apiDoc, null, null, null, null);
+
+			apiDoc.setSwaggerVersion(swaggerVersion);
+			apiDoc.setApiVersion(apiVersion);
+			write(apiDoc, element);
+
+			doc.addApi(new DocumentationEndPoint(api.value(), api.description()));
+
+		}
+		doc.setSwaggerVersion(swaggerVersion);
+		doc.setApiVersion(apiVersion);
+
+		write(doc, null);
+
+		return true;
+	}
+
+	private void write(Documentation doc, Element element) throws Exception {
+		String fileName = doc.getResourcePath() == null ? "resources" : doc.getResourcePath();
+		fileName = StringUtils.removeStart(fileName, "/");
+
+		FileObject resource = null;
+		try {
+			resource = processingEnv.getFiler().createResource(StandardLocation.SOURCE_OUTPUT, "", fileName, element);
+		} catch (Exception e) {
+			// already processed
+		}
+		if (resource != null) {
+			FileUtils.writeStringToFile(new File(resource.toUri()), new ObjectMapper().writeValueAsString(doc));
+		}
+
+	}
+}