Silence Tomcat INFO logs, disableChecksAndJarScan

The TestTomcat worked perfectly well, but generated chatty logs. The
first step was to call `tomcat.setSilent(true)` to suppress most of
these. However, these messages remained:

  Nov 06, 2023 4:40:21 PM org.apache.jasper.servlet.TldScanner scanJars
  INFO: At least one JAR was scanned for TLDs yet contained no TLDs.
  Enable debug logging for this logger for a complete list of JARs that
  were scanned but no TLDs were found in them. Skipping unneeded JARs
  during scanning can improve startup time and JSP compilation time.

  Nov 06, 2023 4:40:21 PM
  org.apache.catalina.loader.WebappClassLoaderBase
  checkThreadLocalsForLeaks
  WARNING: You need to add "--add-opens=java.base/java.lang=ALL-UNNAMED"
  to the JVM command line arguments to enable ThreadLocal memory leak
  detection.  Alternatively, you can suppress this warning by disabling
  ThreadLocal memory leak detection.

  Nov 06, 2023 4:40:21 PM
  org.apache.catalina.loader.WebappClassLoaderBase
  clearReferencesRmiTargets
  WARNING: You need to add
  "--add-opens=java.rmi/sun.rmi.transport=ALL-UNNAMED" to the JVM
  command line arguments to enable RMI Target memory leak detection.
  Alternatively, you can suppress this warning by disabling RMI Target
  memory leak detection.

I had to dig through the Tomcat source and API docs to figure out that I
needed to update the StandardContext returned from `tomcat.addWebapp()`.
Fortunately I remembered from the tutorials linked from the class
comment that this was indeed possible and OK to do.

- https://github.com/apache/tomcat
- https://tomcat.apache.org/tomcat-10.1-doc/api/index.html

strcalc/src/test/java/com/mike_bland/training/testing/utils/TestTomcat.java

@@ -7,9 +7,12 @@
 package com.mike_bland.training.testing.utils;
 
 import org.apache.catalina.LifecycleException;
+import org.apache.catalina.core.StandardContext;
 import org.apache.catalina.startup.Tomcat;
 import org.apache.catalina.webresources.DirResourceSet;
 import org.apache.catalina.webresources.StandardRoot;
+import org.apache.tomcat.JarScanFilter;
+import org.apache.tomcat.JarScanType;
 
 import java.io.File;
 import java.io.IOException;
@@ -51,8 +54,11 @@ public synchronized void start() throws LifecycleException {
         running = true;
         tomcat = new Tomcat();
         tomcat.setPort(port);
+        tomcat.setSilent(true);
 
-        final var ctx = tomcat.addWebapp(contextPath, WEB_APP_DIR);
+        final var ctx = (StandardContext) tomcat.addWebapp(
+                contextPath, WEB_APP_DIR
+        );
         final var root = new StandardRoot(ctx);
         final var resourceSet = new DirResourceSet(
                 root,
@@ -63,6 +69,7 @@ public synchronized void start() throws LifecycleException {
 
         root.addPreResources(resourceSet);
         ctx.setResources(root);
+        disableChecksAndJarScan(ctx);
 
         // getConnector() is a recent requirement the other examples didn't use.
         // - https://stackoverflow.com/questions/15114892/embedded-tomcat-without-web-inf#comment98210881_15235711
@@ -71,6 +78,22 @@ public synchronized void start() throws LifecycleException {
         tomcat.start();
     }
 
+    private static void disableChecksAndJarScan(StandardContext ctx) {
+        ctx.setClearReferencesThreadLocals(false);
+        ctx.setClearReferencesRmiTargets(false);
+        ctx.getJarScanner().setJarScanFilter(new JarScanFilter() {
+            @Override
+            public boolean check(JarScanType jarScanType, String jarName) {
+                return false;
+            }
+
+            @Override
+            public boolean isSkipAll() {
+                return true;
+            }
+        });
+    }
+
     public URI uri() {
         return this.uri;
     }