bind: initialize JNI library on any class load

With the introduction of constructors Java side, all types
become entry points into the library. However the library
was only initialized by the main class until now, resulting
in all other constructors hitting linker errors until an
interaction with the main library class.

This CL fixes that by changing each generated type to touch
the main library class, ensuring that the underlying native
library is loaded.

Change-Id: I640d1dc329e072f8d0753f74ccce87cd9e5aaea8
Reviewed-on: https://go-review.googlesource.com/29994
Reviewed-by: Elias Naur <elias.naur@gmail.com>

bind/genjava.go

@@ -171,7 +171,7 @@ func (g *JavaGen) genStruct(s structInfo) {
 	g.Printf(" {\n")
 	g.Indent()
 
-	g.Printf("{ Seq.touch(); }\n\n")
+	g.Printf("static { %s.touch(); }\n\n", g.className())
 	if jinf != nil {
 		g.Printf("private final Seq.Ref ref;\n\n")
 		for _, f := range jinf.cons {

bind/testdata/classes.java.golden

@@ -7,7 +7,7 @@ package go.java;
 import go.Seq;
 
 public final class Future implements Seq.GoObject, java.util.concurrent.Future {
-    { Seq.touch(); }
+    static { Java.touch(); }
     
     private final Seq.Ref ref;
     
@@ -39,7 +39,7 @@ package go.java;
 import go.Seq;
 
 public final class InputStream extends java.io.InputStream implements Seq.GoObject {
-    { Seq.touch(); }
+    static { Java.touch(); }
     
     private final Seq.Ref ref;
     
@@ -71,7 +71,7 @@ package go.java;
 import go.Seq;
 
 public final class Object extends java.lang.Object implements Seq.GoObject {
-    { Seq.touch(); }
+    static { Java.touch(); }
     
     private final Seq.Ref ref;
     
@@ -95,7 +95,7 @@ package go.java;
 import go.Seq;
 
 public final class Runnable implements Seq.GoObject, java.lang.Runnable {
-    { Seq.touch(); }
+    static { Java.touch(); }
     
     private final Seq.Ref ref;
     

bind/testdata/ignore.java.golden

@@ -7,7 +7,7 @@ package go.ignore;
 import go.Seq;
 
 public final class S extends Seq.Proxy implements I {
-    { Seq.touch(); }
+    static { Ignore.touch(); }
     
     S(Seq.Ref ref) { super(ref); }
     

bind/testdata/issue10788.java.golden

@@ -7,7 +7,7 @@ package go.issue10788;
 import go.Seq;
 
 public final class TestStruct extends Seq.Proxy {
-    { Seq.touch(); }
+    static { Issue10788.touch(); }
     
     TestStruct(Seq.Ref ref) { super(ref); }
     

bind/testdata/issue12328.java.golden

@@ -7,7 +7,7 @@ package go.issue12328;
 import go.Seq;
 
 public final class T extends Seq.Proxy {
-    { Seq.touch(); }
+    static { Issue12328.touch(); }
     
     T(Seq.Ref ref) { super(ref); }
     

bind/testdata/structs.java.golden

@@ -7,7 +7,7 @@ package go.structs;
 import go.Seq;
 
 public final class S extends Seq.Proxy {
-    { Seq.touch(); }
+    static { Structs.touch(); }
     
     S(Seq.Ref ref) { super(ref); }
     
@@ -59,7 +59,7 @@ package go.structs;
 import go.Seq;
 
 public final class S2 extends Seq.Proxy implements I {
-    { Seq.touch(); }
+    static { Structs.touch(); }
     
     S2(Seq.Ref ref) { super(ref); }
     

bind/testdata/vars.java.golden

@@ -7,7 +7,7 @@ package go.vars;
 import go.Seq;
 
 public final class S extends Seq.Proxy implements I {
-    { Seq.touch(); }
+    static { Vars.touch(); }
     
     S(Seq.Ref ref) { super(ref); }