Using the run-test framework

This new way of running tests is developer-centric. It assumes that you have built a jdk locally and want to test it. Running common test targets is simple, and more complex ad-hoc combination of tests is possible. The user interface is forgiving, and clearly report errors it cannot resolve.

Some example command-lines:

$ make run-test-tier1
$ make run-test-jdk_lang JTREG="JOBS=8"
$ make run-test TEST=jdk_lang
$ make run-test-only TEST="gtest:LogTagSet gtest:LogTagSetDescriptions" GTEST="REPEAT=-1"
$ make run-test TEST="hotspot/test:hotspot_gc" JTREG="JOBS=1;TIMEOUT=8;VM_OTIONS=-XshowSettings -Xlog:gc+ref=debug"
$ make run-test TEST="jtreg:hotspot/test:hotspot_gc hotspot/test/native_sanity/"

Test selection

All functionality is available using the run-test make target. In this use case, the test or tests to be executed is controlled using the TEST variable. To speed up subsequent test runs with no source code changes, run-test-only can be used instead, which do not depend on the source and test image build.

For some common top-level tests, direct make targets have been generated. This includes all JTreg test groups, the hotspot gtest, and custom tests (if present). This means that make run-test-tier1 is equivalent to make run-test TEST="tier1", but the latter is more tab-completion friendly. For more complex test runs, the run-test TEST="x" solution needs to be used.

The test specifications given in TEST is parsed into fully qualified test descriptors, which clearly and unambigously show which tests will be run. As an example, :tier1 will expand to jtreg:jdk/test:tier1 jtreg:langtools/test:tier1 jtreg:nashorn/test:tier1 jtreg:jaxp/test:tier1. You can always submit a list of fully qualified test descriptors in the TEST variable if you want to shortcut the parser.


JTreg test groups can be specified either without a test root, e.g. :tier1 (or tier1, the initial colon is optional), or with, e.g. hotspot/test:tier1, jdk/test:jdk_util.

When specified without a test root, all matching groups from all tests roots will be added. Otherwise, only the group from the specified test root will be added.

Individual JTreg tests or directories containing JTreg tests can also be specified, like hotspot/test/native_sanity/ or hotspot/test/native_sanity. You can also specify an absolute path, to point to a JTreg test outside the source tree.

As long as the test groups or test paths can be uniquely resolved, you do not need to enter the jtreg: prefix. If this is not possible, or if you want to use a fully qualified test descriptor, add jtreg:, e.g. jtreg:hotspot/test/native_sanity.


Since the Hotspot Gtest suite is so quick, the default is to run all tests. This is specified by just gtest, or as a fully qualified test descriptor gtest:all.

If you want, you can single out an individual test or a group of tests, for instance gtest:LogDecorations or gtest:LogDecorations.level_test_vm. This can be particularly useful if you want to run a shaky test repeatedly.

Test results and summary

At the end of the test run, a summary of all tests run will be presented. This will have a consistent look, regardless of what test suites were used. This is a sample summary:

Test summary
   TEST                                              TOTAL  PASS  FAIL ERROR
>> jtreg:jdk/test:tier1                               1867  1865     2     0 <<
   jtreg:langtools/test:tier1                         4711  4711     0     0
   jtreg:nashorn/test:tier1                            133   133     0     0

Tests where the number of TOTAL tests does not equal the number of PASSed tests will be considered a test failure. These are marked with the >> ... << marker for easy identification.

The classification of non-passed tests differs a bit between test suites. In the summary, ERROR is used as a catch-all for tests that neither passed nor are classified as failed by the framework. This might indicate test framework error, timeout or other problems.

In case of test failures, make run-test will exit with a non-zero exit value.

All test have their result stored in build/$BUILD/test-result/$TEST_ID, where TEST_ID is a path-safe conversion from the fully qualified test descriptor, e.g. for jtreg:jdk/test:tier1 the TEST_ID is jtreg_jdk_test_tier1. This path is also printed in the log at the end of the test run.

Additional work data is stored in build/$BUILD/test-support/$TEST_ID. For some frameworks, this directory might contain information that is useful in determining the cause of a failed test.

Test suite control

It is possible to control various aspects of the test suites using make control variables.

These variables use a keyword=value approach to allow multiple values to be set. So, for instance, JTREG="JOBS=1;TIMEOUT=8" will set the JTreg concurrency level to 1 and the timeout factor to 8. This is equivalent to setting JTREG_JOBS=1 JTREG_TIMEOUT=8, but using the keyword format means that the JTREG variable is parsed and verified for correctness, so JTREG="TMIEOUT=8" would give an error, while JTREG_TMIEOUT=8 would just pass unnoticed.

To separate multiple keyword=value pairs, use ; (semicolon). Since the shell normally eats ;, the recommended usage is to write the assignment inside qoutes, e.g. JTREG="...;...". This will also make sure spaces are preserved, as in JTREG="VM_OTIONS=-XshowSettings -Xlog:gc+ref=debug".

(Other ways are possible, e.g. using backslash: JTREG=JOBS=1\;TIMEOUT=8. Also, as a special technique, the string %20 will be replaced with space for certain options, e.g. JTREG=VM_OTIONS=-XshowSettings%20-Xlog:gc+ref=debug. This can be useful if you have layers of scripts and have trouble getting proper quoting of command lines arguments through.)

As far as possible, the names of the keywords have been standardized between test suites.

JTreg keywords


The test concurrency (-concurrency).

Defaults to TEST_JOBS (if set by --with-test-jobs=), otherwise it defaults to 1 for hotspot and JOBS for all other components.


The timeout factor (-timeoutFactor).

Defaults to 4.


The test mode (-agentvm, -samevm or -othervm).

Defaults to -agentvm.


Enable asserts (-ea -esa, or none).

Set to true or false. If true, adds -ea -esa. Defaults to true, except for hotspot.


The verbosity level (-verbose).

Defaults to fail,error,summary.


What test data to retain (-retain).

Defaults to fail,error.


Limit memory consumption (-Xmx and -vmoption:-Xmx, or none).

Limit memory consumption for JTreg test framework and VM under test. Set to 0 to disable the limits.

Defaults to 512m, except for hotspot, where it defaults to 0 (no limit).


Additional options to the JTreg test framework.

Use JTREG="OPTIONS=--help all" to see all available JTreg options.


Additional Java options to JTreg (-javaoption).


Additional VM options to JTreg (-vmoption).

Gtest keywords


The number of times to repeat the tests (--gtest_repeat).

Default is 1. Set to -1 to repeat indefinitely. This can be especially useful combined with OPTIONS=--gtest_break_on_failure to reproduce an intermittent problem.


Additional options to the Gtest test framework.

Use GTEST="OPTIONS=--help" to see all available Gtest options.