# Ignition 7.9 and Java Install **URL:** \ **Category:** Ignition\ **Tags:** ignition79\ **Created:** [March 31, 2025, 3:46pm UTC](https://forum.inductiveautomation.com/t/ignition-7-9-and-java-install/104462 "2025-03-31T15:46:00Z")\ **Posts on this page:** 13\ **Page:** 1
**Author:** ![amarks](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/amarks/32/45610_2.png) [@amarks](https://forum.inductiveautomation.com/u/amarks)\ **Post date:** [March 31, 2025, 3:46pm UTC](https://forum.inductiveautomation.com/t/ignition-7-9-and-java-install/104462/1 "2025-03-31T15:46:00Z")
I just installed Ignition 7.9.2 to work on an older project. However, when starting up the gateway I keep getting what looks like java errors. First `Unrecognized VM option 'UseConcMarkSweepGC'` Then `Unrecognized VM option 'CMSClassUnloadingEnabled'` I have Java 8 installed. Is this a PATH issue? ---
**Author:** ![pturmel](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/pturmel/32/3295_2.png) [@pturmel](https://forum.inductiveautomation.com/u/pturmel)\ **Post date:** [March 31, 2025, 3:47pm UTC](https://forum.inductiveautomation.com/t/ignition-7-9-and-java-install/104462/2 "2025-03-31T15:47:07Z")
Yes. Your gateway is running with a newer java. (You should also get rid of those VM options and use G1GC.) ---
**Author:** ![Kevin.Herron](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/kevin.herron/32/7259_2.png) [@Kevin.Herron](https://forum.inductiveautomation.com/u/Kevin.Herron)\ **Post date:** [March 31, 2025, 3:47pm UTC](https://forum.inductiveautomation.com/t/ignition-7-9-and-java-install/104462/3 "2025-03-31T15:47:14Z")
> [@amarks](#): > > I have Java 8 installed. Is this a PATH issue? It might be, because those options should be recognized by JDK 8. What happens if you open a terminal / cmd prompt and run `java -version`? ---
**Author:** ![amarks](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/amarks/32/45610_2.png) [@amarks](https://forum.inductiveautomation.com/u/amarks)\ **Post date:** [March 31, 2025, 3:58pm UTC](https://forum.inductiveautomation.com/t/ignition-7-9-and-java-install/104462/4 "2025-03-31T15:58:13Z")
1.8.0\_402 ---
**Author:** ![Kevin.Herron](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/kevin.herron/32/7259_2.png) [@Kevin.Herron](https://forum.inductiveautomation.com/u/Kevin.Herron)\ **Post date:** [March 31, 2025, 3:59pm UTC](https://forum.inductiveautomation.com/t/ignition-7-9-and-java-install/104462/5 "2025-03-31T15:59:46Z")
Can you upload the ignition.conf file? ---
**Author:** ![Kevin.Herron](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/kevin.herron/32/7259_2.png) [@Kevin.Herron](https://forum.inductiveautomation.com/u/Kevin.Herron)\ **Post date:** [March 31, 2025, 4:01pm UTC](https://forum.inductiveautomation.com/t/ignition-7-9-and-java-install/104462/6 "2025-03-31T16:01:10Z")
> [@Kevin.Herron](#): > > What happens if you open a terminal / cmd prompt and run `java -version`? also in case it needs to be said, this needs to be done on the machine that's actually running the Ignition Gateway. ---
**Author:** ![amarks](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/amarks/32/45610_2.png) [@amarks](https://forum.inductiveautomation.com/u/amarks)\ **Post date:** [March 31, 2025, 4:10pm UTC](https://forum.inductiveautomation.com/t/ignition-7-9-and-java-install/104462/7 "2025-03-31T16:10:56Z")
> [@Kevin.Herron](#): > > > [@Kevin.Herron](#): > > > > What happens if you open a terminal / cmd prompt and run `java -version`? > > also in case it needs to be said, this needs to be done on the machine that's actually running the Ignition Gateway. Yes, it was. ```python #encoding=UTF-8 # Configuration files must begin with a line specifying the encoding # of the the file. # ******************************************************************** # Wrapper License Properties (Ignored by Community Edition) # ******************************************************************** # Professional and Standard Editions of the Wrapper require a valid # License Key to start. Licenses can be purchased or a trial license # requested on the following pages: # http://wrapper.tanukisoftware.com/purchase # http://wrapper.tanukisoftware.com/trial # Include file problems can be debugged by removing the first '#' # from the following line: ##include.debug # The Wrapper will look for either of the following optional files for a # valid License Key. License Key properties can optionally be included # directly in this configuration file. #include ./wrapper-license.conf # The following property will output information about which License Key(s) # are being found, and can aid in resolving any licensing problems. #wrapper.license.debug=TRUE # ******************************************************************** # Wrapper Localization # ******************************************************************** # Specify the locale which the Wrapper should use. By default the system # locale is used. #wrapper.lang=en_US # en_US or ja_JP # Specify the location of the Wrapper's language resources. If these are # missing, the Wrapper will default to the en_US locale. wrapper.lang.folder=../lang # ******************************************************************** # Wrapper Java Properties # ******************************************************************** # Java Application # Locate the java binary on the system PATH: wrapper.java.command=C:/Program Files/Zulu/zulu-21/bin/java.exe # Specify a specific java binary: #set.JAVA_HOME=/java/path #wrapper.java.command=C:/Program Files/Zulu/zulu-21/bin/java.exe # Tell the Wrapper to log the full generated Java command line. #wrapper.java.command.loglevel=INFO # Java Main class. This class must implement the WrapperListener interface # or guarantee that the WrapperManager class is initialized. Helper # classes are provided to do this for you. See the Integration section # of the documentation for details. wrapper.java.mainclass=org.tanukisoftware.wrapper.WrapperSimpleApp # Java Classpath (include wrapper.jar) Add class path elements as # needed starting from 1 wrapper.java.classpath.1=lib/wrapper.jar wrapper.java.classpath.2=lib/catapult.jar # Java Library Path (location of Wrapper.DLL or libwrapper.so) wrapper.java.library.path.1=lib # Java Bits. On applicable platforms, tells the JVM to run in 32 or 64-bit mode. wrapper.java.additional.auto_bits=TRUE # Java Additional Parameters wrapper.java.additional.1=-XX:+UseConcMarkSweepGC wrapper.java.additional.2=-XX:+CMSClassUnloadingEnabled wrapper.java.additional.3=-Ddata.dir=data wrapper.java.additional.4=-Dorg.apache.catalina.loader.WebappClassLoader.ENABLE_CLEAR_REFERENCES=false #wrapper.java.additional.5=-Xdebug #wrapper.java.additional.6=-Xrunjdwp:transport=dt_socket,server=y,suspend=n,address=8000 # Initial Java Heap Size (in MB) wrapper.java.initmemory=1024 # Maximum Java Heap Size (in MB) wrapper.java.maxmemory=2048 # Application parameters. Add parameters as needed starting from 1 wrapper.app.parameter.1=com.inductiveautomation.catapult.Catapult wrapper.shutdown.timeout=120 wrapper.jvm_exit.timeout=120 # Set this value to TRUE to allow ignition.conf to be reloaded when the JVM is restarted wrapper.restart.reload_configuration=TRUE # ******************************************************************** # Wrapper Logging Properties # ******************************************************************** # Enables Debug output from the Wrapper. # wrapper.debug=TRUE # Format of output for the console. (See docs for formats) wrapper.console.format=PM # Log Level for console output. (See docs for log levels) wrapper.console.loglevel=INFO # Log file to use for wrapper output logging. wrapper.logfile=logs/wrapper.log # Format of output for the log file. (See docs for formats) wrapper.logfile.format=LPTM # Log Level for log file output. (See docs for log levels) wrapper.logfile.loglevel=INFO # Maximum size that the log file will be allowed to grow to before # the log is rolled. Size is specified in bytes. The default value # of 0, disables log rolling. May abbreviate with the 'k' (kb) or # 'm' (mb) suffix. For example: 10m = 10 megabytes. wrapper.logfile.maxsize=10m # Maximum number of rolled log files which will be allowed before old # files are deleted. The default value of 0 implies no limit. wrapper.logfile.maxfiles=5 # Log Level for sys/event log output. (See docs for log levels) wrapper.syslog.loglevel=NONE # ******************************************************************** # Wrapper General Properties # ******************************************************************** # Allow for the use of non-contiguous numbered properties wrapper.ignore_sequence_gaps=TRUE # Title to use when running as a console wrapper.console.title=Ignition Gateway # ******************************************************************** # Wrapper JVM Checks # ******************************************************************** # Detect DeadLocked Threads in the JVM. (Requires Standard Edition) #wrapper.check.deadlock=TRUE #wrapper.check.deadlock.interval=60 #wrapper.check.deadlock.action=RESTART #wrapper.check.deadlock.output=FULL # Out Of Memory detection. #wrapper.filter.trigger.1000=java.lang.OutOfMemoryError #wrapper.filter.action.1000=RESTART #wrapper.filter.message.1000=The JVM has run out of memory. wrapper.on_exit.default=SHUTDOWN wrapper.on_exit.2=RESTART # ******************************************************************** # Wrapper Email Notifications. (Requires Professional Edition) # ******************************************************************** # Common Event Email settings. #wrapper.event.default.email.debug=TRUE #wrapper.event.default.email.smtp.host= #wrapper.event.default.email.smtp.port=25 #wrapper.event.default.email.subject=[%WRAPPER_HOSTNAME%:%WRAPPER_NAME%:%WRAPPER_EVENT_NAME%] Event Notification #wrapper.event.default.email.sender= #wrapper.event.default.email.recipient= # Configure the log attached to event emails. #wrapper.event.default.email.attach_log=TRUE #wrapper.event.default.email.maillog.lines=50 #wrapper.event.default.email.maillog.format=LPTM #wrapper.event.default.email.maillog.loglevel=INFO # Enable specific event emails. #wrapper.event.wrapper_start.email=TRUE #wrapper.event.jvm_prelaunch.email=TRUE #wrapper.event.jvm_start.email=TRUE #wrapper.event.jvm_started.email=TRUE #wrapper.event.jvm_deadlock.email=TRUE #wrapper.event.jvm_stop.email=TRUE #wrapper.event.jvm_stopped.email=TRUE #wrapper.event.jvm_restart.email=TRUE #wrapper.event.jvm_failed_invocation.email=TRUE #wrapper.event.jvm_max_failed_invocations.email=TRUE #wrapper.event.jvm_kill.email=TRUE #wrapper.event.jvm_killed.email=TRUE #wrapper.event.jvm_unexpected_exit.email=TRUE #wrapper.event.wrapper_stop.email=TRUE # Specify custom mail content wrapper.event.jvm_restart.email.body=The JVM was restarted.\n\nPlease check on its status.\n # ******************************************************************** # Wrapper Windows NT/2000/XP Service Properties # ******************************************************************** # WARNING - Do not modify any of these properties when an application # using this configuration file has been installed as a service. # Please uninstall the service before modifying this section. The # service can then be reinstalled. # Name of the service wrapper.name=Ignition # Display name of the service wrapper.displayname=Ignition Gateway # Description of the service wrapper.description=Ignition Gateway # Service dependencies. Add dependencies as needed starting from 1 wrapper.ntservice.dependency.1= # Mode in which the service is installed. AUTO_START, DELAY_START or DEMAND_START wrapper.ntservice.starttype=AUTO_START # Allow the service to interact with the desktop. wrapper.ntservice.interactive=false #VERSION - DO NOT MODIFY: 7 ``` ---
**Author:** ![Kevin.Herron](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/kevin.herron/32/7259_2.png) [@Kevin.Herron](https://forum.inductiveautomation.com/u/Kevin.Herron)\ **Post date:** [March 31, 2025, 4:13pm UTC](https://forum.inductiveautomation.com/t/ignition-7-9-and-java-install/104462/8 "2025-03-31T16:13:51Z")
> [@amarks](#): > > `wrapper.java.command=C:/Program Files/Zulu/zulu-21/bin/java.exe` Well then... ---
**Author:** ![amarks](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/amarks/32/45610_2.png) [@amarks](https://forum.inductiveautomation.com/u/amarks)\ **Post date:** [March 31, 2025, 4:31pm UTC](https://forum.inductiveautomation.com/t/ignition-7-9-and-java-install/104462/9 "2025-03-31T16:31:49Z")
That doesn't mean much to me ---
**Author:** ![Kevin.Herron](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/kevin.herron/32/7259_2.png) [@Kevin.Herron](https://forum.inductiveautomation.com/u/Kevin.Herron)\ **Post date:** [March 31, 2025, 4:35pm UTC](https://forum.inductiveautomation.com/t/ignition-7-9-and-java-install/104462/10 "2025-03-31T16:35:42Z")
It's pointing to a Java 21 install. Change the path so it points to wherever you have JDK 8 installed. You can also comment it out to let Ignition use whatever it finds on the PATH variable. ---
**Author:** ![amarks](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/amarks/32/45610_2.png) [@amarks](https://forum.inductiveautomation.com/u/amarks)\ **Post date:** [March 31, 2025, 5:33pm UTC](https://forum.inductiveautomation.com/t/ignition-7-9-and-java-install/104462/11 "2025-03-31T17:33:45Z")
I previously had 8.1 installed. Could that affect this? ---
**Author:** ![Kevin.Herron](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/kevin.herron/32/7259_2.png) [@Kevin.Herron](https://forum.inductiveautomation.com/u/Kevin.Herron)\ **Post date:** [March 31, 2025, 5:34pm UTC](https://forum.inductiveautomation.com/t/ignition-7-9-and-java-install/104462/12 "2025-03-31T17:34:24Z")
No, Ignition 8 includes its own Java runtime, it doesn’t install or need one from your system. ---
**Author:** ![amarks](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/amarks/32/45610_2.png) [@amarks](https://forum.inductiveautomation.com/u/amarks)\ **Post date:** [March 31, 2025, 5:35pm UTC](https://forum.inductiveautomation.com/t/ignition-7-9-and-java-install/104462/13 "2025-03-31T17:35:30Z")
Ok. Updating the path in the conf file to `C:/Program Files/Zulu/zulu-8-jre/bin/java.exe` worked Service is now started