diff --git a/classpath/java-nio.cpp b/classpath/java-nio.cpp
index a7046f8957..66904a26ca 100644
--- a/classpath/java-nio.cpp
+++ b/classpath/java-nio.cpp
@@ -397,7 +397,7 @@ Java_java_nio_channels_SocketChannel_natFinishConnect(JNIEnv *e,
   } else if (einProgress(error)) {
     return false;
   } else if (error != 0) {
-    throwIOException(e);
+    throwIOException(e, errorString(e, error));
   }
   return true;
 }
diff --git a/classpath/java/lang/Thread.java b/classpath/java/lang/Thread.java
index 2e494c850c..fec432b34e 100644
--- a/classpath/java/lang/Thread.java
+++ b/classpath/java/lang/Thread.java
@@ -186,7 +186,11 @@ public class Thread implements Runnable {
   }
 
   public StackTraceElement[] getStackTrace() {
-    return Throwable.resolveTrace(getStackTrace(peer));
+    long p = peer;
+    if (p == 0) {
+      return new StackTraceElement[0];
+    }
+    return Throwable.resolveTrace(getStackTrace(p));
   }
 
   private static native Object getStackTrace(long peer);
diff --git a/classpath/jni-util.h b/classpath/jni-util.h
index d144e704db..cbf33feda9 100644
--- a/classpath/jni-util.h
+++ b/classpath/jni-util.h
@@ -19,11 +19,12 @@
 #if (defined __MINGW32__) || (defined _MSC_VER)
 #  define PLATFORM_WINDOWS
 #  define PATH_SEPARATOR ';'
-#  define JNIEXPORT __declspec(dllexport)
+#  define JNIEXPORT __declspec(dllexport) __attribute__ ((externally_visible))
 #else
 #  define PLATFORM_POSIX
 #  define PATH_SEPARATOR ':'
-#  define JNIEXPORT __attribute__ ((visibility("default")))
+#  define JNIEXPORT __attribute__ ((visibility("default"))) \
+  __attribute__ ((externally_visible))
 #endif
 
 #ifdef _MSC_VER
diff --git a/src/boot.cpp b/src/boot.cpp
index e313b6c553..c2980dc48e 100644
--- a/src/boot.cpp
+++ b/src/boot.cpp
@@ -27,10 +27,10 @@ extern "C" void __cxa_pure_virtual(void) { abort(); }
 #ifdef BOOT_IMAGE
 
 #if (defined __MINGW32__) || (defined _MSC_VER)
-#  define EXPORT __declspec(dllexport)
+#  define EXPORT __declspec(dllexport) __attribute__ ((externally_visible))
 #  define SYMBOL(x) binary_bootimage_bin_##x
 #else
-#  define EXPORT __attribute__ ((visibility("default")))
+#  define EXPORT __attribute__ ((visibility("default"))) __attribute__ ((externally_visible))
 #  define SYMBOL(x) _binary_bootimage_bin_##x
 #endif
 
@@ -53,10 +53,10 @@ extern "C" {
 #ifdef BOOT_CLASSPATH
 
 #if (defined __MINGW32__) || (defined _MSC_VER)
-#  define EXPORT __declspec(dllexport)
+#  define EXPORT __declspec(dllexport) __attribute__ ((externally_visible))
 #  define SYMBOL(x) binary_classpath_jar_##x
 #else
-#  define EXPORT __attribute__ ((visibility("default")))
+#  define EXPORT __attribute__ ((visibility("default"))) __attribute__ ((externally_visible))
 #  define SYMBOL(x) _binary_classpath_jar_##x
 #endif
 
diff --git a/src/common.h b/src/common.h
index ac7a4e6c21..0257237c5f 100644
--- a/src/common.h
+++ b/src/common.h
@@ -90,10 +90,10 @@ typedef uint64_t uintptr_t;
 
 #undef JNIEXPORT
 #ifdef PLATFORM_WINDOWS
-#  define JNIEXPORT __declspec(dllexport)
+#  define JNIEXPORT __declspec(dllexport) __attribute__ ((externally_visible))
 #  define PATH_SEPARATOR ';'
 #else
-#  define JNIEXPORT __attribute__ ((visibility("default")))
+#  define JNIEXPORT __attribute__ ((visibility("default"))) __attribute__ ((externally_visible))
 #  define PATH_SEPARATOR ':'
 #endif