HardwareSimulator Errors on start

[calderete]

When trying to start the HardwareSimulator I'm getting

"Error: Unable to initialize main class HardwareSimulatorMain"
"Caused by: java.lang.NoClassDefFoundError: Hack/HardwareSimulator/HardwareSimulatorControllerGUI"

Im on mac OS X Mojave. The results of java -version is

java version "11.0.1" 2018-10-16 LTS
Java(TM) SE Runtime Environment 18.9 (build 11.0.1+13-LTS)
Java HotSpot(TM) 64-Bit Server VM 18.9 (build 11.0.1+13-LTS, mixed mode)

Any help would be much appreciated!

[ivant]

There are a couple of things you can try. First, this is an older project, so you may wish to try using Java 8 instead of Java 11.

You can also start the hardware simulator with the following command (from the terminal):

/bin/sh -x ./HardwareSimulator.sh

and copy and paste the output here, to get further help.

[calderete]

Thank you so much for the help.

The result of running this command '/bin/sh +x ./HardwareSimulator.sh' on
java 11 is -

Error: Unable to initialize main class HardwareSimulatorMain
Caused by: java.lang.NoClassDefFoundError:
Hack/HardwareSimulator/HardwareSimulatorControllerGUI

After switching to 8 by this method -

bash-3.2$ /usr/libexec/java_home -V
Matching Java Virtual Machines (2):
    11.0.1, x86_64: "Java SE 11.0.1"
/Library/Java/JavaVirtualMachines/jdk-11.0.1.jdk/Contents/Home
    1.8.0_73, x86_64: "Java SE 8"
/Library/Java/JavaVirtualMachines/jdk1.8.0_73.jdk/Contents/Home

bash-3.2$ export JAVA_HOME=`/usr/libexec/java_home -v 1.8`
bash-3.2$ export JAVA_HOME=$(/usr/libexec/java_home -v 1.8)
bash-3.2$ java -version
java version "1.8.0_73"
Java(TM) SE Runtime Environment (build 1.8.0_73-b02)
Java HotSpot(TM) 64-Bit Server VM (build 25.73-b02, mixed mode)

And running the same command gives this error -

bash-3.2$ Error: A JNI error has occurred, please check your installation
and try again
Exception in thread "main" java.lang.NoClassDefFoundError:
Hack/HardwareSimulator/HardwareSimulatorControllerGUI
at java.lang.Class.getDeclaredMethods0(Native Method)
at java.lang.Class.privateGetDeclaredMethods(Class.java:2701)
at java.lang.Class.privateGetMethodRecursive(Class.java:3048)
at java.lang.Class.getMethod0(Class.java:3018)
at java.lang.Class.getMethod(Class.java:1784)
at sun.launcher.LauncherHelper.validateMainClass(LauncherHelper.java:544)
at sun.launcher.LauncherHelper.checkAndLoadMain(LauncherHelper.java:526)
Caused by: java.lang.ClassNotFoundException:
Hack.HardwareSimulator.HardwareSimulatorControllerGUI
at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
... 7 more






On Tue, Apr 16, 2019 at 1:49 AM ivant [via Nand2Tetris Questions and
Answers Forum] <[e-mail]> wrote:

> There are a couple of things you can try. First, this is an older project,
> so you may wish to try using Java 8 instead of Java 11.
>
> You can also start the hardware simulator with the following command (from
> the terminal):
>
> /bin/sh -x ./HardwareSimulator.sh
>
> and copy and paste the output here, to get further help.
>
> ------------------------------
> If you reply to this email, your message will be added to the discussion
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>
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[ivant]

It looks like the classpath isn't set up correctly. Please run it with

sh -x ./HardwareSimulator.sh

and paste the result here.

[calderete]

The result of running /bin/sh +x ./HardwareSimulator.sh is

Error: A JNI error has occurred, please check your installation and try again
Exception in thread "main" java.lang.NoClassDefFoundError: Hack/HardwareSimulator/HardwareSimulatorControllerGUI

This is using java 8

[ivant]

That's why I asked for -x. This will print out each command that sh is executing.

[calderete]

this is the full terminal output

bash-3.2$ tools/HardwareSimulator.sh
bash-3.2$ Error: A JNI error has occurred, please check your installation and try again
Exception in thread "main" java.lang.NoClassDefFoundError: Hack/HardwareSimulator/HardwareSimulatorControllerGUI
        at java.lang.Class.getDeclaredMethods0(Native Method)
        at java.lang.Class.privateGetDeclaredMethods(Class.java:2701)
        at java.lang.Class.privateGetMethodRecursive(Class.java:3048)
        at java.lang.Class.getMethod0(Class.java:3018)
        at java.lang.Class.getMethod(Class.java:1784)
        at sun.launcher.LauncherHelper.validateMainClass(LauncherHelper.java:544)
        at sun.launcher.LauncherHelper.checkAndLoadMain(LauncherHelper.java:526)
Caused by: java.lang.ClassNotFoundException: Hack.HardwareSimulator.HardwareSimulatorControllerGUI
        at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
        at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
        ... 7 more

[ivant]

I'll try one last time. Here is the way I'm asking to run this, so I can see what's going on, along with the output I'm getting:

$ sh -x tools/HardwareSimulator.sh 
+ unset CDPATH
+ test -L tools/HardwareSimulator.sh
+ echo tools/HardwareSimulator.sh
+ script=tools/HardwareSimulator.sh
+ dir=/tmp/t/nand2tetris
+ dirname tools/HardwareSimulator.sh
+ cd tools
+ [ ( 0 -gt 1 ) -o (  = -h ) -o (  = --help ) ]
+ [ 0 -eq 0 ]
+ java -classpath :bin/classes:BuiltIn:bin/lib/Hack.jar:bin/lib/HackGUI.jar:bin/lib/Simulators.jar:bin/lib/SimulatorsGUI.jar:bin/lib/Compilers.jar HardwareSimulatorMain

So, instead of running just tools/HardwareSimulator.sh, please run: sh -x tools/HardwareSimulator.sh and paste the output.

[calderete]

I apologize for the misunderstanding. I should have double checked all the text before i sent it. The result is the same if I use "/bin/sh +x ./HardwareSimulator.sh" (see below) I'm executing this command for the tools dir


bash-3.2$ /bin/sh +x ./HardwareSimulator.sh
bash-3.2$ Error: A JNI error has occurred, please check your installation and try again
Exception in thread "main" java.lang.NoClassDefFoundError: Hack/HardwareSimulator/HardwareSimulatorControllerGUI
        at java.lang.Class.getDeclaredMethods0(Native Method)
        at java.lang.Class.privateGetDeclaredMethods(Class.java:2701)
        at java.lang.Class.privateGetMethodRecursive(Class.java:3048)
        at java.lang.Class.getMethod0(Class.java:3018)
        at java.lang.Class.getMethod(Class.java:1784)
        at sun.launcher.LauncherHelper.validateMainClass(LauncherHelper.java:544)
        at sun.launcher.LauncherHelper.checkAndLoadMain(LauncherHelper.java:526)
Caused by: java.lang.ClassNotFoundException: Hack.HardwareSimulator.HardwareSimulatorControllerGUI
        at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
        at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
        ... 7 more

[ivant]

You either cannot distinguish between -x and +x or you are trolling.

[calderete]

gotcha. Sorry about that.

with the corrected command the output is

bash-3.2$ /bin/sh -x ./HardwareSimulator.sh
+ unset CDPATH
++ test -L ./HardwareSimulator.sh
++ echo ./HardwareSimulator.sh
+ script=./HardwareSimulator.sh
+ dir=/Users/alderetecharles/nand2tetris/nand2tetris/nand2tetris/tools
++ dirname ./HardwareSimulator.sh
+ cd .
+ '[' '(' 0 -gt 1 ')' -o '(' '' = -h ')' -o '(' '' = --help ')' ']'
+ '[' 0 -eq 0 ']'
+ java -classpath :bin/classes:BuiltIn:bin/lib/Hack.jar:bin/lib/HackGUI.jar:bin/lib/Simulators.jar:bin/lib/SimulatorsGUI.jar:bin/lib/Compilers.jar HardwareSimulatorMain
bash-3.2$ Error: A JNI error has occurred, please check your installation and try again
Exception in thread "main" java.lang.NoClassDefFoundError: Hack/HardwareSimulator/HardwareSimulatorControllerGUI
        at java.lang.Class.getDeclaredMethods0(Native Method)
        at java.lang.Class.privateGetDeclaredMethods(Class.java:2701)
        at java.lang.Class.privateGetMethodRecursive(Class.java:3048)
        at java.lang.Class.getMethod0(Class.java:3018)
        at java.lang.Class.getMethod(Class.java:1784)
        at sun.launcher.LauncherHelper.validateMainClass(LauncherHelper.java:544)
        at sun.launcher.LauncherHelper.checkAndLoadMain(LauncherHelper.java:526)
Caused by: java.lang.ClassNotFoundException: Hack.HardwareSimulator.HardwareSimulatorControllerGUI
        at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
        at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
        ... 7 more

[calderete]

I assure you I'm not trolling.

[ivant]

calderete wrote

gotcha. Sorry about that.

with the corrected command the output is

bash-3.2$ /bin/sh -x ./HardwareSimulator.sh
+ unset CDPATH
++ test -L ./HardwareSimulator.sh
++ echo ./HardwareSimulator.sh
+ script=./HardwareSimulator.sh
+ dir=/Users/alderetecharles/nand2tetris/nand2tetris/nand2tetris/tools
++ dirname ./HardwareSimulator.sh
+ cd .
+ '[' '(' 0 -gt 1 ')' -o '(' '' = -h ')' -o '(' '' = --help ')' ']'
+ '[' 0 -eq 0 ']'
+ java -classpath :bin/classes:BuiltIn:bin/lib/Hack.jar:bin/lib/HackGUI.jar:bin/lib/Simulators.jar:bin/lib/SimulatorsGUI.jar:bin/lib/Compilers.jar HardwareSimulatorMain
bash-3.2$ Error: A JNI error has occurred, please check your installation and try again
Exception in thread "main" java.lang.NoClassDefFoundError: Hack/HardwareSimulator/HardwareSimulatorControllerGUI
        at java.lang.Class.getDeclaredMethods0(Native Method)
        at java.lang.Class.privateGetDeclaredMethods(Class.java:2701)
        at java.lang.Class.privateGetMethodRecursive(Class.java:3048)
        at java.lang.Class.getMethod0(Class.java:3018)
        at java.lang.Class.getMethod(Class.java:1784)
        at sun.launcher.LauncherHelper.validateMainClass(LauncherHelper.java:544)
        at sun.launcher.LauncherHelper.checkAndLoadMain(LauncherHelper.java:526)
Caused by: java.lang.ClassNotFoundException: Hack.HardwareSimulator.HardwareSimulatorControllerGUI
        at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
        at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
        ... 7 more

... [show rest of quote]

... [show rest of quote]

I can't find anything obviously wrong. There several more things to try:

1. Download and unpack the tools again in a new folder.

2. The path to the scripts looks like this: /Users/alderetecharles/nand2tetris/nand2tetris/nand2tetris/tools. A few years ago Windows had a problem with folder named like its parent folder. I don't know if that's a problem in MacOS, but I'd try moving this just to make sure.

3. If both of the above fail you can run java directly from the tools folder, like this:

java -verbose:class -verbose:jni -classpath :bin/classes:BuiltIn:bin/lib/Hack.jar:bin/lib/HackGUI.jar:bin/lib/Simulators.jar:bin/lib/SimulatorsGUI.jar:bin/lib/Compilers.jar HardwareSimulatorMain | gzip > hwsim.log.gz

You can then send me the logs to see if they'll tel us something more.

[calderete]

I have it working now thank you for your help and patience! I believe it may have been a combination of the location and my java 8 install. After moving the file I was still getting errors and the error logs that were produced also had no obvious errors in it. After upgrading from java 1.8.0_73 to 1.8.0_212 the simulator UI was able to start.

[ivant]

Glad to hear it and have fun with the course.

[kirti purohit]

I am getting  this error after running the comand can you please help me out?

[ivant]

Have you read the messages in the thread above?

Tell us what OS and Java versions you are using. Also copy and paste (not screenshot please) the result of running

/bin/sh -x HardwareSimulator.sh