diff --git a/java/README.md b/java/README.md
index 6816fa3d6c97..8b99e91c5893 100644
--- a/java/README.md
+++ b/java/README.md
@@ -14,7 +14,7 @@ This directory contains the java worker, with the following components.
 
 ```sh
 # build native components
-sh ../build.sh -l java "$@"
+sh ../build.sh -l java
 
 # build java worker
 mvn clean install -Dmaven.test.skip
diff --git a/src/plasma/lib/java/org_ray_spi_impl_PlasmaClientJNI.cc b/src/plasma/lib/java/org_ray_spi_impl_PlasmaClientJNI.cc
index 9b5aa00ec42b..f00107190863 100644
--- a/src/plasma/lib/java/org_ray_spi_impl_PlasmaClientJNI.cc
+++ b/src/plasma/lib/java/org_ray_spi_impl_PlasmaClientJNI.cc
@@ -180,10 +180,10 @@ JNIEXPORT jobjectArray JNICALL Java_org_ray_spi_impl_PlasmaClientJNI_get
     jobject dataBuf, metadataBuf;
     for (int i = 0; i < num_oids; ++i) {
         o = env->NewObjectArray(2, clsByteBuffer, NULL);
-        if (obufs[i].data_size != -1) {
-            dataBuf = env->NewDirectByteBuffer(const_cast<uint8_t *>(obufs[i].data->data()), obufs[i].data_size);
-            if (obufs[i].metadata_size > 0) {
-                metadataBuf = env->NewDirectByteBuffer(const_cast<uint8_t *>(obufs[i].metadata->data()), obufs[i].metadata_size);
+        if (obufs[i].data && obufs[i].data->size() != -1 ) {
+            dataBuf = env->NewDirectByteBuffer(const_cast<uint8_t *>(obufs[i].data->data()), obufs[i].data->size());
+            if (obufs[i].metadata && obufs[i].metadata->size() > 0) {
+                metadataBuf = env->NewDirectByteBuffer(const_cast<uint8_t *>(obufs[i].metadata->data()), obufs[i].metadata->size());
             }
             else {
                 metadataBuf = NULL;