I think that a better place to check 'ignoreunrecognized' is on 'else' branch on line 867(for locked flags) and on 'else' branch on line 870(where we actually found unrecognized option). If 'ignoreunrecognized' is true, then return true in this case, otherwise execute code in these 'else' branches. This shows the message below:.Java HotSpot(TM) 64-Bit Server VM warning: Option UseConcMarkSweepGC was deprecated in version 9.0 and will likely be removed in a future release.Unrecognized VM option 'UseParNewGC'.Error: Could not create the Java Virtual Machine.Error: A fatal exception has occurred. Program will exit. Hello, I am doing a project where a class variable gets updated and that new value needs to go into a different class. The only way i was able to do this was by making it a static variable in its original class and then referencing it by className.staticVariable, but. Java HotSpot(TM) 64-Bit Server VM warning: Option UseParNewGC was deprecated in version 9.0 and will likely be removed in a future release. Unrecognized VM option 'PrintHeapAtGC' Error: Could not create the Java Virtual Machine. Error: A fatal exception has occurred. Program will exit.
- Java Unrecognized Option Module Path
- Unrecognized Option Error For Java In Mac Os
- As Unrecognized Option 64
- Unrecognized Option Xincgc
After installing JDK 9 (build 1.9.0-ea-b53) on my Mac, the Spring Framework build fails with the following error: Unrecognized VM option 'MaxPermSize=256m' Error: Could not create the Java Virtual Machine. Error: A fatal exception has occurred. Program will exit. However, the Spring Framework build does not set the MaxPermSize JVM argument.
Running into an issue beyond my experience level.
In Installed and started Solr 7.3. But, then I realized I need to use an
older 6.x version (for Drupal)
So, I installed Solr 6.6.3. But, it will not start.
The message I get is:
**Still not seeing Solr listening on 8983 after 180 seconds!*
*tail: /Applications/solr-6.6.3/server/logs/solr.log: No such file or
directory**
I get the same same result, whether I use *bin/solr start* or *sudo*.
The solr.log is definitely missing. But there is a Solr-8983-console.log.
This shows the message below:
**Java HotSpot(TM) 64-Bit Server VM warning: Option UseConcMarkSweepGC was
deprecated in version 9.0 and will likely be removed in a future release.*
*Unrecognized VM option 'UseParNewGC'*
*Error: Could not create the Java Virtual Machine.*
*Error: A fatal exception has occurred. Program will exit.**
Java -version displays as 10.0.1. This is a work computer with security
needs, and I believe I need to keep it as updated as possible:
**java version '10.0.1' 2018-04-17*
*Java(TM) SE Runtime Environment 18.3 (build 10.0.1+10)*
*Java HotSpot(TM) 64-Bit Server VM 18.3 (build 10.0.1+10, mixed mode)**
Also tried with Solr 6.6.3, 6.6.0 and 5.0.0 with same failure and log
message.
If relevant, I'm on a 2015 macbook pro, using high sierra 10.13.3
-->In Installed and started Solr 7.3. But, then I realized I need to use an
older 6.x version (for Drupal)
So, I installed Solr 6.6.3. But, it will not start.
The message I get is:
**Still not seeing Solr listening on 8983 after 180 seconds!*
*tail: /Applications/solr-6.6.3/server/logs/solr.log: No such file or
directory**
I get the same same result, whether I use *bin/solr start* or *sudo*.
The solr.log is definitely missing. But there is a Solr-8983-console.log.
This shows the message below:
**Java HotSpot(TM) 64-Bit Server VM warning: Option UseConcMarkSweepGC was
deprecated in version 9.0 and will likely be removed in a future release.*
*Unrecognized VM option 'UseParNewGC'*
*Error: Could not create the Java Virtual Machine.*
*Error: A fatal exception has occurred. Program will exit.**
Java -version displays as 10.0.1. This is a work computer with security
needs, and I believe I need to keep it as updated as possible:
**java version '10.0.1' 2018-04-17*
*Java(TM) SE Runtime Environment 18.3 (build 10.0.1+10)*
*Java HotSpot(TM) 64-Bit Server VM 18.3 (build 10.0.1+10, mixed mode)**
Also tried with Solr 6.6.3, 6.6.0 and 5.0.0 with same failure and log
message.
If relevant, I'm on a 2015 macbook pro, using high sierra 10.13.3
There's no one-size-fits-all solution to transition code from Java 8 to Java 11.For a non-trivial application, moving from Java 8 to Java 11 can be a significantamount of work. Potential issues include removed API, deprecated packages, use ofinternal API, changes to class loaders, and changes to garbage collection.
In general, the approaches are to try to run on Java 11 without recompiling, or tocompile with JDK 11 first. If the goal is to get an application up and running asquickly as possible, just trying to run on Java 11 is often the best approach.For a library, the goal will be to publish an artifact that is compiled and testedwith JDK 11.
Moving to Java 11 is worth the effort. New features have been added andenhancements have been made since Java 8. Microsoft office for mac. These features and enhancementsimprove startup, performance, memory usage, and provide better integrationwith containers. And there are additions and modifications to API thatimprove developer productivity.
This document touches on tools to inspect code. It also coversissues that you may run into and recommendationsfor resolving them. You should also consult other guides, such as theOracle JDK Migration Guide. How to make existing codemodular is not covered here.
The toolbox
Java 11 has two tools, jdeprscan and jdeps, that are useful for sniffing out potential issues. These tools can be run against existing class or jar files. You can assess the transition effort without having to recompile.
jdeprscan looks for use of deprecated or removed API.Use of deprecated API is not a blocking issue, but is something to look into. Is there anupdated jar file? Do you need to log an issue to address the use of deprecated API? Use ofremoved API is a blocking issue that has to be addressed before you tryto run on Java 11.
jdeps, which is a Java classdependency analyzer. When used with the
--jdk-internals
option, jdeps tells you whichclass depends on which internal API. You can continue to use internal API in Java 11, butreplacing the usage should be a priority. The OpenJDK wiki pageJava Dependency Analysis Toolhas recommended replacements for some commonly used JDK internal APIs.There are jdeps and jdeprscan plugins for both Gradle and Maven. We recommend adding thesetools to your build scripts.
Tool | Gradle Plugin | Maven Plugin |
---|---|---|
jdeps | jdeps-gradle-plugin | Apache Maven JDeps Plugin |
jdeprscan | jdeprscan-gradle-plugin | Apache Maven JDeprScan Plugin |
The Java compiler itself, javac, is another tool in your toolbox. The warnings and errors you get from jdeprscan and jdeps will come out of the compiler. The advantage of usingjdeprscan and jdeps is that you can run these tools over existing jars and class files, includingthird-party libraries.
What jdeprscan and jdeps cannot do is warn about the use of reflection to access encapsulated API.Reflective access is checked at runtime. Ultimately, you have to run the code on Java 11 to know with certainty.
Using jdeprscan
The easiest way to use jdeprscan isto give it a jar file from an existing build. You can also give it a directory, such as the compileroutput directory, or an individual class name. Use the
--release 11
option to get the most completelist of deprecated API. If you want to prioritize which deprecated API to go after, dial the settingback to --release 8
. API that was deprecated in Java 8 is likely to be removed sooner thanAPI that has been deprecated more recently.The jdeprscan tool generates an error message if it has trouble resolving a dependent class.For example,
error: cannot find class org/apache/logging/log4j/Logger
. Adding dependentclasses to the --class-path
or using the application class-path is recommended, but the tool will continue the scan without it.The argument is ‑‑class‑path. No other variationsof the class-path argument will work.This output tells us that the
com.company.Util
class is calling a deprecated constructor of thejava.lang.Double
class. The javadoc will recommend API to use in place of deprecated API.No amount of work will resolve the error: cannot find class sun/misc/BASE64Encoder
because it is API that has been removed. Since Java 8, java.util.Base64
should be used.Run
jdeprscan --release 11 --list
to get a sense of what API has been deprecated since Java 8.To get a list of API that has been removed, run jdeprscan --release 11 --list --for-removal
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Using jdeps
Use jdeps, with the
--jdk-internals
option to find dependencies on JDK internal API. The command line option --multi-release 11
is needed for this example because log4j-core-2.13.0.jar is amulti-release jar file.Without this option, jdeps will complain if it finds a multi-release jar file. The option specifies which version ofclass files to inspect.The output gives some good advice on eliminating use of JDK internal API! Where possible,the replacement API is suggested. The name of the module where the package is encapsulatedis given in the parentheses. The module name can be used with
--add-exports
or --add-opens
if it is necessary to explicitly break encapsulation.The use of sun.misc.BASE64Encoder or sun.misc.BASE64Decoderwill result in a java.lang.NoClassDefFoundError in Java 11. Code that uses theseAPIs has to be modified to use java.util.Base64.
Try to eliminate the use of any API coming from the module jdk.unsupported. API fromthis module will reference JDK Enhancement Proposal (JEP) 260as a suggested replacement.In a nutshell, JEP 260 says that the use of internal API will be supported untilreplacement API is available. Even though your codemay use JDK internal API, it will continue to run, for a while at least. Do take a look atJEP 260 since it does point to replacements for some internal API.variable handlescan be used in place of some sun.misc.Unsafe API, for example.
jdeps can do more than just scan for use of JDK internals. It is a useful tool for analyzingdependencies and for generating a module-info files. Take a look at the documentation for more.
Using javac
Compiling with JDK 11 will require updates to build scripts, tools, test frameworks,and included libraries. Use the
-Xlint:unchecked
option for javac to get thedetails on use of JDK internal API and other warnings. It may also be necessary to use--add-opens
or --add-reads
to expose encapsulated packages to the compiler (see JEP 261).Libraries can consider packaging as amulti-release jar file.Multi-release jar files allow you to support both Java 8 and Java 11 runtimesfrom the same jar file. They do add complexity to the build. How to buildmulti-release jars is beyond the scope of this document.
Running on Java 11
Most applications should run on Java 11 without modification. The first thing to tryis to run on Java 11 without recompiling the code. The point of just running is tosee what warnings and errors come out of the execution. This approach gets an
application to run on Java 11 more quickly by focusing on the minimum that needsto be done.
application to run on Java 11 more quickly by focusing on the minimum that needsto be done.
Most of the problems you may encounter can be resolved without having to recompile code.If an issue has to be fixed in the code, then make the fix but continue to compilewith JDK 8. If possible, work on getting the application to run with
java
version 11 before compiling with JDK 11.Check command line options
Before running on Java 11, do a quick scan of the command-line options.Options that have been removed will cause the Java VirtualMachine (JVM) to exit. This check is especially important if you use GC logging options sincethey have changed drastically from Java 8. The JaCoLine tool is a good one to useto detect problems with the command line options.
Check third-party libraries
A potential source of trouble is third-party libraries that you don't control. You canproactively update third-party libraries to more recent versions. Or you can seewhat falls out of running the application and only update those libraries that are necessary.The problem with updating all libraries to a recent version is that it makes itharder to find root cause if there is some error in the application. Did the error happenbecause of some updated library? Or was the error caused by some change inthe runtime? The problem with updating only what's necessary is that it maytake several iterations to resolve.
The recommendation here is to make as few changes as possible and to updatethird-party libraries as a separate effort. If you do update a third-party library,more often than not you will want the latest-and-greatest version that is compatiblewith Java 11.Depending on how far behind your current version is, you may want to takea more cautious approach and upgrade to the first Java 9+ compatible version.
In addition to looking at release notes, you can use jdeps and jdeprscanto assess the jar file. Also, the OpenJDK Quality Group maintains aQuality Outreachwiki page that lists the status of testing of many Free Open Source Software (FOSS)projects against versions of OpenJDK.
Explicitly set garbage collection
The Parallel garbage collector (Parallel GC) is the default GC in Java 8. If the application is using thedefault, then the GC should be explicitly set with the command-line option
-XX:+UseParallelGC
.The default changed in Java 9 to the Garbage First garbage collector (G1GC). In order to make afair comparison of an application running on Java 8 versus Java 11, the GC settingsmust be the same. Experimenting with the GC settings should bedeferred until the application has been validated on Java 11.Explicitly set default options
Java Unrecognized Option Module Path
If running on the HotSpot VM, setting the command line option
-XX:+PrintCommandLineFlags
will dump the values of options set by the VM, particularly the defaults set by the GC.Run with this flag on Java 8 and use the printed options when running on Java 11.For the most part, the defaults are the same from 8 to 11. But using the settings from8 ensures parity.Setting the command line option
Once the application runs on Java 11, set
--illegal-access=warn
is recommended.In Java 11, using reflection to access to JDK-internal API will result in anillegal reflective access warning.By default, the warning is only issued forthe first illegal access. Setting --illegal-access=warn
will cause a warningon every illegal reflective access. You will find more case if illegal access with the option set to warn. But you will also get a lot of redundant warnings.Once the application runs on Java 11, set
--illegal-access=deny
to mimicthe future behavior of the Java runtime. Starting with Java 16, the default willbe --illegal-access=deny
.ClassLoader cautions
In Java 8, you can cast the system class loader to a
URLClassLoader
. This is usually done by applications and libraries thatwant to inject classes into the classpath at runtime. The class loader hierarchy haschanged in Java 11. The system class loader (also known as the application class loader) is now an internal class.Casting to a URLClassLoader
will throw a ClassCastException
at runtime. Java 11 does not have APIto dynamically augment the classpath at runtime but it can be done through reflection, with the obvious caveatsabout using internal API.In Java 11, the boot class loader only loads core modules. If you create a class loader witha null parent, it may not find all platform classes. In Java 11, you need to pass
ClassLoader.getPlatformClassLoader()
instead of null
as the parent class loader in such cases.Locale data changes
The default source for locale data in Java 11 was changed with JEP 252 to the Unicode Consortium's Common Locale Data Repository.This may have an impact on localized formatting. Set the system property
java.locale.providers=COMPAT,SPI
to revert to the Java 8 locale behavior, if necessary.Potential issues
Here are some of the common issues you might come across. Follow the links for more details about these issues.
Unrecognized options
If a command-line option has been removed, the application will print
Unrecognized option:
or Unrecognized VM option
followed by the nameof the offending option. An unrecognized option will cause the VM to exit.Options that have been deprecated, but not removed, will producea VM warning.In general, options that were removed have no replacement and the only recourse is to remove the optionfrom the command line. The exception is options for garbage collection logging. GC logging wasreimplemented in Java 9 to use theunified JVM logging framework. Refer to 'Table 2-2 Mapping Legacy Garbage Collection Logging Flags to the Xlog Configuration' in the section Enable Logging with the JVM Unified Logging Framework of the Java SE 11 Tools Reference.
VM warnings
Use of deprecated options will produce a warning. An option is deprecated when it has been replacedor is no longer useful. As with removed options, these options should beremoved from the command line.The warning
VM Warning: Option <option> was deprecated
means that the option is still supported,but that support may be removed in the future.An option that is no longer supported and will generate the warning VM Warning: Ignoring option
.Options that are no longer supported have no effect on the runtime.The web page VM Options Explorer provides an exhaustivelist of options that have been added to or removed from Java since JDK 7.
Error: Could not create the Java Virtual Machine
This error message is printed when the JVM encounters an unrecognized option.
WARNING: An illegal reflective access operation has occurred
When Java code uses reflection to access JDK-internal API, the runtime will issue anillegal reflective access warning.
What this means is that a module has not exported the package thatis being accessed through reflection. The package is encapsulated in the module and is,basically, internal API. The warning can be ignored as a first effort to getting up and running on Java 11.The Java 11 runtime permits the reflective access so that legacy code cancontinue to work.
To address this warning, look for updated code that does not make use ofthe internal API. If the issue cannot be resolved with updated code, either the
--add-exports
or the --add-opens
command-line option can be used to open access to the package.These options allow access to unexported types of one module from another module.The
--add-exports
option allows the target module to access the public types of the named packageof the source module. Sometimes code will use setAccessible(true)
to access non-public members and API. This is known asdeep reflection. In this case, use --add-opens
to give your code access to the non-publicmembers of a package. If you are unsure whether to use --add-exports or --add-opens, start with--add-exports.The
--add-exports
or --add-opens
options should be considered as a work-around, not a long-term solution.Using these options breaks encapsulation of the module system, which ismeant to keep JDK-internal API from being used. If the internal APIis removed or changes, the application will fail. Reflective access will bedenied in Java 16, except where access enabled by command line options such as --add-opens
.To mimic the future behavior, set --illegal-access=deny
on the command line.The warning in the example above is issued because the
sun.nio.ch
package is notexported by the java.base
module. In other words, there is no exports sun.nio.ch;
in the module-info.java
file of module java.base
. This can be resolved with --add-exports=java.base/sun.nio.ch=ALL-UNNAMED
.Classes that are not defined in a module implicitly belong to the unnamed module, literally named ALL-UNNAMED
.java.lang.reflect.InaccessibleObjectException
This exception indicates that you are trying to call
setAccessible(true)
on a field or method of an encapsulated class.You may also get an illegal reflective access warning. Use the--add-opens
optionto give your code access to the non-public members of a package. The exception message will tell you the module 'does not open' thepackage to the module that is trying to call setAccessible. If the module is 'unnamed module', use UNNAMED-MODULE
as the target-module in the --add-opens option.java.lang.NoClassDefFoundError
NoClassDefFoundError is most likely caused by a split package, or by referencing removed modules.
NoClassDefFoundError caused by split-packages
A split package is when a package is found in more than one library. The symptom of a split-packageproblem is that a class you know to be on the class-path is not found.
This issue will only occur when using the module-path. The Java module system optimizesclass lookup by restricting a package to one named module. The runtime gives preference to themodule-path over the class-path when doing a class lookup. If a package is split betweena module and the class-path, only the module is used to do the class lookup. This can leadto
NoClassDefFound
errors.An easy way to check for a split package is to plug your module path and class path into jdepsand use the path to your application class files as the <path>. If there is a split package,jdeps will print out a warning:
Warning: split package: <package-name> <module-path> <split-path>
.This issue can be resolved by using
--patch-module <module-name>=<path>[,<path>]
to add the split package into the named module.NoClassDefFoundError caused by using Java EE or CORBA modules
If the application runs on Java 8 but throws a
java.lang.NoClassDefFoundError
or ajava.lang.ClassNotFoundException
, then it islikely that the application is using a package from the Java EE or CORBA modules.These modules were deprecated in Java 9 and removed in Java 11.To resolve the issue, add a runtime dependency to your project.
Removed module | Affected Package | Suggested dependency |
---|---|---|
Java API for XML Web Services (JAX-WS) | java.xml.ws | JAX WS RI Runtime |
Java Architecture for XML Binding (JAXB) | java.xml.bind | JAXB Runtime |
JavaBeans Activation Framework (JAV) | java.activation | JavaBeans (TM) Activation Framework |
Common Annotations | java.xml.ws.annotation | Javax Annotation API |
Common Object Request Broker Architecture (CORBA) | java.corba | GlassFish CORBA ORB |
Java Transaction API (JTA) | java.transaction | Java Transaction API |
-Xbootclasspath/p is no longer a supported option
Support for
-Xbootclasspath/p
has been removed. Use --patch-module
instead. The --patch-module option is described in JEP 261. Look for the section labeled 'Patching module content'. --patch-module can be used with javac and with java to override or augment the classes in a module.What --patch-module does, in effect, is insert the patch module into the module system's class lookup. The module system willgrab the class from the patch module first. This is the same effect as pre-pending the bootclasspath in Java 8.
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UnsupportedClassVersionError
This exception means that you are trying to run code that was compiled with a later version of Java on an earlier version of Java. For example, you are running on Java 11 with a jar that was compiled with JDK 13.
Unrecognized Option Error For Java In Mac Os
Java version | Class file format version |
---|---|
8 | 52 |
9 | 53 |
10 | 54 |
11 | 55 |
12 | 56 |
13 | 57 |
As Unrecognized Option 64
Next steps
Unrecognized Option Xincgc
Once the application runs on Java 11, consider moving libraries off theclass-path and onto the module-path. Look for updated versions of the libraries yourapplication depends on. Choose modular libraries, if available. Use themodule-path as much as possible, even if you don't plan on using modulesin your application. Using the module-path has better performance forclass loading than the class-path does.