From 4dce64449d13ec20bb509954298168bd1dfe160b Mon Sep 17 00:00:00 2001
From: Marko Luukkainen <marko.luukkainen@semantum.fi>
Date: Thu, 14 Nov 2019 17:38:15 +0200
Subject: [PATCH] Loading VTK dlls with plug-in activator.

gitlab #50

Change-Id: Iae39a7d1e38e48156a532b5002b7c88edfa1d709
(cherry picked from commit 3523a218827de60e1aa4ce7be126342418ddb054)
---
 vtk/META-INF/MANIFEST.MF       |  3 +++
 vtk/src/vtk/Activator.java     | 19 +++++++++++++++++++
 vtk/src/vtk/vtkJavaDep.java    | 31 +++++++++++++++++++------------
 vtk/src/vtk/vtkObjectBase.java |  1 -
 4 files changed, 41 insertions(+), 13 deletions(-)
 create mode 100644 vtk/src/vtk/Activator.java

diff --git a/vtk/META-INF/MANIFEST.MF b/vtk/META-INF/MANIFEST.MF
index 641b1d16..ac7adfe2 100644
--- a/vtk/META-INF/MANIFEST.MF
+++ b/vtk/META-INF/MANIFEST.MF
@@ -6,3 +6,6 @@ Bundle-Version: 8.2.0.qualifier
 Automatic-Module-Name: vtk
 Bundle-RequiredExecutionEnvironment: JavaSE-1.8
 Export-Package: vtk
+Bundle-ActivationPolicy: lazy
+Bundle-Activator: vtk.Activator
+Require-Bundle: org.eclipse.core.runtime;bundle-version="3.13.0"
diff --git a/vtk/src/vtk/Activator.java b/vtk/src/vtk/Activator.java
new file mode 100644
index 00000000..98031ca8
--- /dev/null
+++ b/vtk/src/vtk/Activator.java
@@ -0,0 +1,19 @@
+package vtk;
+
+import org.osgi.framework.BundleActivator;
+import org.osgi.framework.BundleContext;
+
+public class Activator implements BundleActivator {
+    
+    @Override
+    public void start(BundleContext context) throws Exception {
+        vtkJavaDep.load();
+        
+    } 
+    
+    @Override
+    public void stop(BundleContext context) throws Exception {
+        
+    }
+
+}
diff --git a/vtk/src/vtk/vtkJavaDep.java b/vtk/src/vtk/vtkJavaDep.java
index c482235a..0377199e 100644
--- a/vtk/src/vtk/vtkJavaDep.java
+++ b/vtk/src/vtk/vtkJavaDep.java
@@ -8,7 +8,6 @@ package vtk;
  */
 public class vtkJavaDep {
 	  static String[] libs = new String[] {
-			  "jawt",
 			  "vtksys",
 			  "vtkCommonCore",
 		      "vtkWrappingJava",
@@ -121,20 +120,28 @@ public class vtkJavaDep {
 		      "vtkIOImportJava",
 
 		      };
+	
+	private static boolean loaded = false;
 
+    static void load() {
+        if (!loaded) {
 
-	static {
-		try {
-			Class.forName("java.awt.Toolkit");
-		} catch (ClassNotFoundException e) {
-			throw new IllegalStateException(e);
-		}
+            try {
+                Class.forName("java.awt.Toolkit");
+            } catch (ClassNotFoundException e) {
+                throw new IllegalStateException(e);
+            }
+            try {
+                System.loadLibrary("jawt");
+            } catch (UnsatisfiedLinkError e) {
+                // bypass potential load error. If jawt is not really loaded, we will get errors
+                // with VTK dlls.
+            }
 
-		for (String lib : libs)
-			System.loadLibrary(lib);
-	}
-
-	static void load() {
+            for (String lib : libs)
+                System.loadLibrary(lib);
 
+            loaded = true;
+	    }
 	}
 }
diff --git a/vtk/src/vtk/vtkObjectBase.java b/vtk/src/vtk/vtkObjectBase.java
index 5b88cd51..539aa966 100644
--- a/vtk/src/vtk/vtkObjectBase.java
+++ b/vtk/src/vtk/vtkObjectBase.java
@@ -44,7 +44,6 @@ public class vtkObjectBase
 
   public static vtk.vtkJavaMemoryManager JAVA_OBJECT_MANAGER = new vtk.vtkJavaMemoryManagerImpl();
   public vtkObjectBase() {
-	  vtkJavaDep.load();
     this.vtkId = this.VTKInit();
     vtkObjectBase.JAVA_OBJECT_MANAGER.registerJavaObject(this.vtkId, this);
 }
-- 
2.47.1