Java scenario test for networking (#244)

Disabling java-network scenario test for now due to #245

.azure-pipelines/scripts/disabled_tests.txt

@@ -7,3 +7,4 @@ tests/basic/network/Makefile
 tests/containers/unencrypted/env/Makefile
 tests/virtio/ping_test/Makefile
 tests/virtio/python_read/Makefile
+tests/languages/java/network/Makefile

tests/languages/java/network/Dockerfile

@@ -0,0 +1,4 @@
+FROM openjdk:8-alpine
+COPY ./app /app
+WORKDIR /app
+RUN javac -source 1.8 -target 1.8 *.java

tests/languages/java/network/Makefile

@@ -0,0 +1,34 @@
+include ../../../common.mk
+
+APP_ROOT=app
+PROG_SRC=${APP_ROOT}/MainApp.java
+PROG=MainApp
+
+DISK_IMAGE=sgxlkl-java.img
+IMAGE_SIZE=400M
+
+ifeq ($(SGXLKL_VERBOSE),)
+SGXLKL_ENV=\
+   SGXLKL_TAP=sgxlkl_tap0 SGXLKL_VERBOSE=1 SGXLKL_KERNEL_VERBOSE=1 SGXLKL_TRACE_LKL_SYSCALL=0 SGXLKL_TRACE_SIGNAL=0
+else
+SGXLKL_ENV=
+endif
+
+.DELETE_ON_ERROR:
+.PHONY: run run-hw run-sw clean
+
+$(DISK_IMAGE): $(PROG_SRC)
+	${SGXLKL_DISK_TOOL} create --size=${IMAGE_SIZE} --docker=Dockerfile ${DISK_IMAGE}
+
+run: run-hw run-sw
+
+run-hw: $(DISK_IMAGE)
+	@echo "sgx-lkl-java --hw-debug ${DISK_IMAGE} ${PROG}"
+	@${SGXLKL_ENV} ${SGXLKL_JAVA_RUN} --hw-debug ${DISK_IMAGE} ${PROG}
+
+run-sw: $(DISK_IMAGE)
+	@echo "sgx-lkl-java --sw-debug ${DISK_IMAGE} ${PROG}"
+	@${SGXLKL_ENV} ${SGXLKL_JAVA_RUN} --sw-debug ${DISK_IMAGE} ${PROG}
+
+clean:
+	rm -f $(DISK_IMAGE)

tests/languages/java/network/app/MainApp.java

@@ -0,0 +1,19 @@
+import java.io.*;
+import java.net.*;
+
+public class MainApp
+{
+	public static void main(String[] args) throws MalformedURLException {
+		URL url = new URL("https://www.microsoft.com/");
+
+		try (BufferedReader reader = new BufferedReader(new InputStreamReader(url.openStream(), "UTF-8"))) {
+			for (String line; (line = reader.readLine()) != null;) {
+				System.out.println(line);
+			}
+		} catch(Exception e) {
+			System.out.println(e);
+			System.exit(1);
+		}
+	}
+
+}