diff --git a/openjdk-7-jdk/Dockerfile b/openjdk-7-jdk/Dockerfile
index 5bdc68f..e036181 100644
--- a/openjdk-7-jdk/Dockerfile
+++ b/openjdk-7-jdk/Dockerfile
@@ -9,6 +9,7 @@ yum clean all
 
 # Set environment variables.
 ENV HOME /root
+ENV JAVA_HOME=/usr/lib/jvm/java-1.7.0-openjdk
 
 # Define working directory.
 WORKDIR /root
diff --git a/openjdk-8-jdk/Dockerfile b/openjdk-8-jdk/Dockerfile
index a812cd0..c77cfa3 100644
--- a/openjdk-8-jdk/Dockerfile
+++ b/openjdk-8-jdk/Dockerfile
@@ -9,6 +9,7 @@ yum clean all
 
 # Set environment variables.
 ENV HOME /root
+ENV JAVA_HOME=/usr/lib/jvm/java-1.8.0-openjdk
 
 # Define working directory.
 WORKDIR /root
diff --git a/oracle-7-jdk/Dockerfile b/oracle-7-jdk/Dockerfile
index 23c1c5b..20494f6 100644
--- a/oracle-7-jdk/Dockerfile
+++ b/oracle-7-jdk/Dockerfile
@@ -11,6 +11,7 @@ rm -rf /var/cache/yum
 
 # Set environment variables.
 ENV HOME /root
+ENV JAVA_HOME=/usr/java/jdk-7
 
 # Define working directory.
 WORKDIR /root
diff --git a/oracle-8-jdk/Dockerfile b/oracle-8-jdk/Dockerfile
index 54e7fe2..f28248e 100644
--- a/oracle-8-jdk/Dockerfile
+++ b/oracle-8-jdk/Dockerfile
@@ -18,6 +18,7 @@ rm -rf /var/cache/yum
 
 # Set environment variables.
 ENV HOME /root
+ENV JAVA_HOME=/usr/java/jdk-8
 
 # Define working directory.
 WORKDIR /root
diff --git a/oracle-9-jdk/Dockerfile b/oracle-9-jdk/Dockerfile
index 7d92e0f..f5fe541 100644
--- a/oracle-9-jdk/Dockerfile
+++ b/oracle-9-jdk/Dockerfile
@@ -11,6 +11,7 @@ yum clean all
 
 # Set environment variables.
 ENV HOME /root
+ENV JAVA_HOME=/usr/java/jdk-9
 
 # Define working directory.
 WORKDIR /root