Fix: JAXB + Java >= 9 Class Loader Bug & Ensure Tomcat Deployment

- Problem: Jaxb + JAVA >= 9 Runtime + Tomcat = ClassNotFoundException:
  ContextFactory.

  Reason: Apparently, jaxb uses the "wrong" classloader (the system
  classloader via the thread classloader) and this classloader does
  not know about jaxb api's and implementations at runtime since
  oracle decided to move jaxb* out of JRE.

  Solution: create a new thread, override the thread's "thread"
  classloader with the "class" classloader and do all jaxb
  interactions in that thread. See:
  https://sjhannah.com/blog/2018/11/21/jaxb-hell-on-jdk-9/

- Move "run jaxb interactions in own thread with class class loader"
  code into own component (JaxbClassNotFoundFix,
  runInTheadWithClassClassLoader) and wrap ClientFactory and
  Marshaller code into the "runInTheadWithClassClassLoader".

- Ensure that app can be deployed in a Tomcat container (by following
  this guide: https://www.baeldung.com/spring-boot-war-tomcat-deploy)

1 files changed, 4 insertions, 1 deletions

diff --git a/src/main/java/at/gv/egiz/moazs/client/ClientFactory.java b/src/main/java/at/gv/egiz/moazs/client/ClientFactory.java
index 94eb712..818c4c9 100644
--- a/src/main/java/at/gv/egiz/moazs/client/ClientFactory.java
+++ b/src/main/java/at/gv/egiz/moazs/client/ClientFactory.java
@@ -2,6 +2,7 @@ package at.gv.egiz.moazs.client;
 
 import at.gv.egiz.moazs.preprocess.ConfigUtil;
 import at.gv.egiz.moazs.util.FileUtils;
+import at.gv.egiz.moazs.util.JAXBClassNotFoundFix;
 import at.gv.egiz.moazs.util.StoreSOAPBodyBinaryInRepositoryInterceptor;
 import at.gv.zustellung.app2mzs.xsd.ClientType;
 import at.gv.zustellung.app2mzs.xsd.KeyStoreType;
@@ -25,7 +26,6 @@ import javax.xml.ws.BindingProvider;
 import javax.xml.ws.soap.SOAPBinding;
 
 import static at.gv.zustellung.app2mzs.xsd.KeyStoreType.keyStoreTypeBuilder;
-import static java.util.stream.Collectors.toMap;
 
 @Component
 public class ClientFactory {
@@ -54,7 +54,10 @@ public class ClientFactory {
      * @return the client
      */
     public <T> T create(ClientType params, Class<T> clazz) {
+        return JAXBClassNotFoundFix.runInTheadWithClassClassLoader(() -> createClient(params, clazz));
+    }
 
+    private <T> T createClient(ClientType params, Class<T> clazz) {
         var factory = new JaxWsClientFactoryBean();
         factory.setServiceClass(clazz);
         factory.setAddress(params.getURL());