Bug 580848 - Change usage of SLF4J to use Import-Package and dynamic lookup of bundle name

plugins/org.eclipse.wst.server.preview.adapter/META-INF/MANIFEST.MF

diff --git a/plugins/org.eclipse.wst.server.preview.adapter/META-INF/MANIFEST.MF b/plugins/org.eclipse.wst.server.preview.adapter/META-INF/MANIFEST.MF
index 4e9d07f..1d9f37b 100644
--- a/plugins/org.eclipse.wst.server.preview.adapter/META-INF/MANIFEST.MF
+++ b/plugins/org.eclipse.wst.server.preview.adapter/META-INF/MANIFEST.MF
@@ -15,4 +15,5 @@
 Bundle-RequiredExecutionEnvironment: JavaSE-11
 Export-Package: org.eclipse.wst.server.preview.adapter.internal.core;x-internal:=true,
  org.eclipse.wst.server.preview.adapter.internal.ui;x-internal:=true
-Import-Package: javax.servlet;version="3.1.0"
+Import-Package: javax.servlet;version="3.1.0",
+ org.slf4j;version="[1.7.0, 3)"

plugins/org.eclipse.wst.server.preview.adapter/src/org/eclipse/wst/server/preview/adapter/internal/core/PreviewLaunchConfigurationDelegate.java

diff --git a/plugins/org.eclipse.wst.server.preview.adapter/src/org/eclipse/wst/server/preview/adapter/internal/core/PreviewLaunchConfigurationDelegate.java b/plugins/org.eclipse.wst.server.preview.adapter/src/org/eclipse/wst/server/preview/adapter/internal/core/PreviewLaunchConfigurationDelegate.java
index c6dd30d..1d7f71b 100644
--- a/plugins/org.eclipse.wst.server.preview.adapter/src/org/eclipse/wst/server/preview/adapter/internal/core/PreviewLaunchConfigurationDelegate.java
+++ b/plugins/org.eclipse.wst.server.preview.adapter/src/org/eclipse/wst/server/preview/adapter/internal/core/PreviewLaunchConfigurationDelegate.java
@@ -50,7 +50,7 @@
 	// corresponds to CLASSPATH_BIN_INDEX_PREVIEW_SERVER
 	private static final String[] REQUIRED_BUNDLE_IDS = new String[] {
 		getBundleForClass(javax.servlet.ServletContext.class),
-		"org.slf4j.api",
+		getBundleForClass(org.slf4j.LoggerFactory.class),
 		"org.eclipse.jetty.http",
 		"org.eclipse.jetty.io",
 		"org.eclipse.jetty.security",