Add JUL implementation

Author: wsargent

README.md

@@ -56,6 +56,12 @@ Debug sysErrDebug = new PrintStreamDebug(System.err);
 provider.setDebug(sysErrDebug);
 ```
 
+or use java.util.logging:
+
+```java
+provider.setDebug(new LoggingDebug(DEBUG, debugLogger));
+```
+
 And you can add your own logging framework by extending `AbstractDebug`:
 
 ```java

lib/build.gradle.kts

@@ -10,6 +10,7 @@ plugins {
     `java-library`
     `maven-publish` // https://docs.gradle.org/current/userguide/publishing_maven.html
     signing
+    id("com.diffplug.spotless") version "7.0.0.BETA4"
 }
 
 repositories {

lib/src/main/java/com/tersesystems/debugjsse/AbstractDebug.java

@@ -9,6 +9,11 @@
 import java.util.*;
 import java.util.concurrent.atomic.AtomicInteger;
 
+/**
+ * This is an abstract class that provides helpful defaults for most of the Debug interface.
+ *
+ * There's three methods you have to implement, but the key/trust manager is taken care of for you.
+ */
 public abstract class AbstractDebug implements Debug {
 
     public abstract void enter(String message);

lib/src/main/java/com/tersesystems/debugjsse/DebugJSSEProvider.java

@@ -1,31 +1,20 @@
 package com.tersesystems.debugjsse;
 
-import javax.net.ssl.KeyManagerFactory;
-import javax.net.ssl.SSLContext;
-import javax.net.ssl.SSLContextSpi;
-import javax.net.ssl.TrustManagerFactory;
-
 import java.security.NoSuchAlgorithmException;
 import java.security.NoSuchProviderException;
 import java.security.Provider;
 import java.security.Security;
 import java.util.Arrays;
 import java.util.Collections;
-import java.util.Set;
 
 public class DebugJSSEProvider extends Provider {
 
-    private static String defaultKeyManagerAlgorithm;
-    private static String defaultTrustManagerAlgorithm;
-
     public final static String NAME = "debugJSSE";
     public final static Double VERSION = 1.0;
     public final static String INFO = "Debug JSSE";
 
-     private static final String SSL_KEY_MANAGER_FACTORY_SECPROP = "ssl.KeyManagerFactory.algorithm";
-     private static final String SSL_TRUST_MANAGER_FACTORY_SECPROP = "ssl.TrustManagerFactory.algorithm";
-     private static final String KEY_MANAGER_FACTORY = "KeyManagerFactory";
-     private static final String TRUST_MANAGER_FACTORY = "TrustManagerFactory";
+    private static final String KEY_MANAGER_FACTORY = "KeyManagerFactory";
+    private static final String TRUST_MANAGER_FACTORY = "TrustManagerFactory";
 
     private static boolean enabled = false;
 

lib/src/main/java/com/tersesystems/debugjsse/LoggingDebug.java

@@ -0,0 +1,33 @@
+package com.tersesystems.debugjsse;
+
+import java.util.logging.Level;
+import java.util.logging.Logger;
+
+/**
+ * This is a class that logs to the given logger at the given log level.
+ */
+public class LoggingDebug extends AbstractDebug {
+
+    private final Logger logger;
+    private final Level level;
+
+    public LoggingDebug(Level level, Logger logger) {
+        this.level = level;
+        this.logger = logger;
+    }
+
+    @Override
+    public void enter(String message) {
+        logger.log(level, message);
+    }
+
+    @Override
+    public void exit(String message) {
+        logger.log(level, message);
+    }
+
+    @Override
+    public void exception(String message, Exception e) {
+        logger.log(level, message);
+    }
+}

lib/src/main/java/com/tersesystems/debugjsse/PrintStreamDebug.java

@@ -1,9 +1,10 @@
 package com.tersesystems.debugjsse;
 
-import javax.net.ssl.KeyManagerFactory;
-import javax.net.ssl.TrustManagerFactory;
 import java.io.PrintStream;
 
+/**
+ * This is a class that prints to a PrintStream on debug output.
+ */
 public class PrintStreamDebug extends AbstractDebug {
 
     private final PrintStream stream;

lib/src/main/java/com/tersesystems/debugjsse/SystemOutDebug.java

@@ -1,5 +1,8 @@
 package com.tersesystems.debugjsse;
 
+/**
+ * This class writes to System.out for debugging output.
+ */
 public class SystemOutDebug extends PrintStreamDebug {
     public SystemOutDebug() {
         super(System.out);