cherif-benali
commented
3 years ago "Unsupported major.minor version 52.0 " i think it is a problem of JDK/JRE mismatch. i had the same error because i programmed a java console program with JDK 1.8 and JRE 1.8 , in the other side my contiki 2.7 and cooja had 1.7 JDK/JRE , so i compile the project with 1.7 JDK and JRE and this problem is solved.
I installed Contiki 3.0 under Ubuntu 16.04 64 bits.But, i can't start cooja simulator. I am not able to understand what is the issue. How to resolve it? The result after building cooja is :
Buildfile: /home/ramzi/contiki/tools/cooja/build.xml
init:
compile:
copy configs:
jar_cooja: [jar] Building jar: /home/ramzi/contiki/tools/cooja/dist/cooja.jar
jar:
init:
compile:
jar: [jar] Building jar: /home/ramzi/contiki/tools/cooja/apps/mrm/lib/mrm.jar
init:
mspsim:
init:
compile:
jar: [jar] Building jar: /home/ramzi/contiki/tools/mspsim/mspsim.jar [copy] Copying 1 file to /home/ramzi/contiki/tools/cooja/apps/mspsim/lib
coffee:
init:
compile: [javac] Compiling 8 source files to /home/ramzi/contiki/tools/coffee-manager/build
configs:
jar: [jar] Building jar: /home/ramzi/contiki/tools/coffee-manager/coffee.jar [copy] Copying 1 file to /home/ramzi/contiki/tools/cooja/apps/mspsim/lib
compile:
copy:
jar: [jar] Building jar: /home/ramzi/contiki/tools/cooja/apps/mspsim/lib/cooja_mspsim.jar
init:
compile:
jar: [jar] Building jar: /home/ramzi/contiki/tools/cooja/apps/avrora/lib/cooja_avrora.jar
init:
clean: [delete] Deleting directory /home/ramzi/contiki/tools/cooja/apps/serial_socket/build
compile: [mkdir] Created dir: /home/ramzi/contiki/tools/cooja/apps/serial_socket/build [javac] Compiling 2 source files to /home/ramzi/contiki/tools/cooja/apps/serial_socket/build [javac] warning: /home/ramzi/contiki/tools/cooja/dist/cooja.jar(org/contikios/cooja/ClassDescription.class): major version 52 is newer than 51, the highest major version supported by this compiler. [javac] It is recommended that the compiler be upgraded. [javac] warning: /home/ramzi/contiki/tools/cooja/dist/cooja.jar(org/contikios/cooja/Cooja.class): major version 52 is newer than 51, the highest major version supported by this compiler. [javac] It is recommended that the compiler be upgraded. [javac] warning: /home/ramzi/contiki/tools/cooja/dist/cooja.jar(org/contikios/cooja/Mote.class): major version 52 is newer than 51, the highest major version supported by this compiler. [javac] It is recommended that the compiler be upgraded. [javac] warning: /home/ramzi/contiki/tools/cooja/dist/cooja.jar(org/contikios/cooja/MotePlugin.class): major version 52 is newer than 51, the highest major version supported by this compiler. [javac] It is recommended that the compiler be upgraded. [javac] warning: /home/ramzi/contiki/tools/cooja/dist/cooja.jar(org/contikios/cooja/PluginType.class): major version 52 is newer than 51, the highest major version supported by this compiler. [javac] It is recommended that the compiler be upgraded. [javac] warning: /home/ramzi/contiki/tools/cooja/dist/cooja.jar(org/contikios/cooja/Simulation.class): major version 52 is newer than 51, the highest major version supported by this compiler. [javac] It is recommended that the compiler be upgraded. [javac] warning: /home/ramzi/contiki/tools/cooja/dist/cooja.jar(org/contikios/cooja/VisPlugin.class): major version 52 is newer than 51, the highest major version supported by this compiler. [javac] It is recommended that the compiler be upgraded. [javac] warning: /home/ramzi/contiki/tools/cooja/dist/cooja.jar(org/contikios/cooja/interfaces/SerialPort.class): major version 52 is newer than 51, the highest major version supported by this compiler. [javac] It is recommended that the compiler be upgraded. [javac] warning: /home/ramzi/contiki/tools/cooja/dist/cooja.jar(org/contikios/cooja/Plugin.class): major version 52 is newer than 51, the highest major version supported by this compiler. [javac] It is recommended that the compiler be upgraded. [javac] warning: /home/ramzi/contiki/tools/cooja/dist/cooja.jar(org/contikios/cooja/MoteInterfaceHandler.class): major version 52 is newer than 51, the highest major version supported by this compiler. [javac] It is recommended that the compiler be upgraded. [javac] warning: /home/ramzi/contiki/tools/cooja/dist/cooja.jar(org/contikios/cooja/interfaces/Log.class): major version 52 is newer than 51, the highest major version supported by this compiler. [javac] It is recommended that the compiler be upgraded. [javac] warning: /home/ramzi/contiki/tools/cooja/dist/cooja.jar(org/contikios/cooja/MoteInterface.class): major version 52 is newer than 51, the highest major version supported by this compiler. [javac] It is recommended that the compiler be upgraded. [javac] 12 warnings
jar: [jar] Building jar: /home/ramzi/contiki/tools/cooja/apps/serial_socket/lib/serial_socket.jar
init:
compile:
jar: [jar] Building jar: /home/ramzi/contiki/tools/cooja/apps/collect-view/cooja-collect-view.jar
init:
compile:
jar: [jar] Building jar: /home/ramzi/contiki/tools/collect-view/dist/collect-view.jar
init:
clean: [delete] Deleting directory /home/ramzi/contiki/tools/cooja/apps/powertracker/build
compile: [mkdir] Created dir: /home/ramzi/contiki/tools/cooja/apps/powertracker/build [javac] Compiling 1 source file to /home/ramzi/contiki/tools/cooja/apps/powertracker/build [javac] warning: /home/ramzi/contiki/tools/cooja/dist/cooja.jar(org/contikios/cooja/ClassDescription.class): major version 52 is newer than 51, the highest major version supported by this compiler. [javac] It is recommended that the compiler be upgraded. [javac] warning: /home/ramzi/contiki/tools/cooja/dist/cooja.jar(org/contikios/cooja/Cooja.class): major version 52 is newer than 51, the highest major version supported by this compiler. [javac] It is recommended that the compiler be upgraded. [javac] warning: /home/ramzi/contiki/tools/cooja/dist/cooja.jar(org/contikios/cooja/Mote.class): major version 52 is newer than 51, the highest major version supported by this compiler. [javac] It is recommended that the compiler be upgraded. [javac] warning: /home/ramzi/contiki/tools/cooja/dist/cooja.jar(org/contikios/cooja/PluginType.class): major version 52 is newer than 51, the highest major version supported by this compiler. [javac] It is recommended that the compiler be upgraded. [javac] warning: /home/ramzi/contiki/tools/cooja/dist/cooja.jar(org/contikios/cooja/SimEventCentral.class): major version 52 is newer than 51, the highest major version supported by this compiler. [javac] It is recommended that the compiler be upgraded. [javac] warning: /home/ramzi/contiki/tools/cooja/dist/cooja.jar(org/contikios/cooja/SimEventCentral$MoteCountListener.class): major version 52 is newer than 51, the highest major version supported by this compiler. [javac] It is recommended that the compiler be upgraded. [javac] warning: /home/ramzi/contiki/tools/cooja/dist/cooja.jar(org/contikios/cooja/Simulation.class): major version 52 is newer than 51, the highest major version supported by this compiler. [javac] It is recommended that the compiler be upgraded. [javac] warning: /home/ramzi/contiki/tools/cooja/dist/cooja.jar(org/contikios/cooja/VisPlugin.class): major version 52 is newer than 51, the highest major version supported by this compiler. [javac] It is recommended that the compiler be upgraded. [javac] warning: /home/ramzi/contiki/tools/cooja/dist/cooja.jar(org/contikios/cooja/interfaces/Radio.class): major version 52 is newer than 51, the highest major version supported by this compiler. [javac] It is recommended that the compiler be upgraded. [javac] warning: /home/ramzi/contiki/tools/cooja/dist/cooja.jar(org/contikios/cooja/Plugin.class): major version 52 is newer than 51, the highest major version supported by this compiler. [javac] It is recommended that the compiler be upgraded. [javac] warning: /home/ramzi/contiki/tools/cooja/dist/cooja.jar(org/contikios/cooja/MoteInterfaceHandler.class): major version 52 is newer than 51, the highest major version supported by this compiler. [javac] It is recommended that the compiler be upgraded. [javac] warning: /home/ramzi/contiki/tools/cooja/dist/cooja.jar(org/contikios/cooja/MoteInterface.class): major version 52 is newer than 51, the highest major version supported by this compiler. [javac] It is recommended that the compiler be upgraded. [javac] 12 warnings
jar: [jar] Building jar: /home/ramzi/contiki/tools/cooja/apps/powertracker/lib/powertracker.jar
run: [java] Exception in thread "main" java.lang.UnsupportedClassVersionError: org/contikios/cooja/Cooja : Unsupported major.minor version 52.0 [java] at java.lang.ClassLoader.defineClass1(Native Method) [java] at java.lang.ClassLoader.defineClass(ClassLoader.java:803) [java] at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142) [java] at java.net.URLClassLoader.defineClass(URLClassLoader.java:449) [java] at java.net.URLClassLoader.access$100(URLClassLoader.java:71) [java] at java.net.URLClassLoader$1.run(URLClassLoader.java:361) [java] at java.net.URLClassLoader$1.run(URLClassLoader.java:355) [java] at java.security.AccessController.doPrivileged(Native Method) [java] at java.net.URLClassLoader.findClass(URLClassLoader.java:354) [java] at java.lang.ClassLoader.loadClass(ClassLoader.java:425) [java] at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308) [java] at java.lang.ClassLoader.loadClass(ClassLoader.java:358) [java] at sun.launcher.LauncherHelper.checkAndLoadMain(LauncherHelper.java:482) [java] Java Result: 1
BUILD SUCCESSFUL Total time: 4 seconds