If you use Ubuntu: * Install JDK 7: sudo apt-get install openjdk-7-jdk * Config path jdk in file ireport.config (in forder: "package that you downloaded"/etc/): # default location of JDK/JRE, can be overridden by using --jdkhome <dir> switchjdkhome="/usr/lib/jvm/java-7-openjdk-amd64"[/code]!Note: NOT --jdkhome="/usr/lib/jvm/java-7-openjdk-amd64" * Update: Open iReport on Ubuntu 18.04 Step1: Download JD7: https://www.oracle.com/technetwork/java/javase/downloads/java-archive-downloads-javase7-521261.html Step2: Edit file ireport.conf: # default location of JDK/JRE, can be overridden by using --jdkhome <dir> switch jdkhome="/home/user/Documents/tool/jdk-7u80-linux-x64/jdk1.7.0_80" (Point to the JDK folder just downloaded in step 1)