openjdk: provide hjava launcher utility.

dev-lang/openjdk/sources/hjava.cpp

@@ -0,0 +1,24 @@
+#include <stdlib.h>
+#include <stdio.h>
+#include <limits.h>
+
+int main(int argc, char* argv[])
+{
+	if (argc < 2) {
+		system("alert --stop \"Java: Please specify a Jarfile.\" >/dev/null");
+		return 1;
+	}
+
+	char command[PATH_MAX];
+	snprintf(command, sizeof(command), "%s -jar \"%s\"", JAVA_BINARY, argv[1]);
+
+	FILE* fd = popen(command, "r");
+	if (fd != NULL) {
+		char buffer[512];
+		fgets(buffer, 512, fd);
+		return pclose(fd);
+	} else
+		system("alert --stop \"Java: popen failed!\" >/dev/null");
+
+	return 1;
+}