java - Could not reserve enough space for object heap when running JUnit tests -

java - Could not reserve enough space for object heap when running JUnit tests -

in project have unit tests. using intellij. whenever seek run them, intellij shows message:

error occured during initialization of vm

could not reserve plenty space object heap

could not create java virtual machine.

i tried run tests vm arguments run configuration -> vm options: -xms256m -xmx512m have read lot problem (and proposed solutions), tried many combinations, none of them worked. became frustrated , thought test "too complicated" (mocks , things that...), have written sample test:

public class testclass { @test public void test() { asserttrue(true); } }

i still getting same error! problem occurs only when running tests - other methods run fine. ideas may cause unusual , annoying error? new intellij, maybe missing something.

update

i tried run tests command line, same result. able run them, adding -dforkmode=never maven command. still not able run test(s) intellij.

i faced same issue resolved me. if using maven, can configure default jvm args or other test options need passed runs adding similar properties pom.xml. might want note kind of master setting junit runs.

<plugin> <groupid>org.apache.maven.plugins</groupid> <artifactid>maven-surefire-plugin</artifactid> <version>2.8.1</version> <configuration> <argline>-xms500m -xmx1g</argline> <enableassertions>true</enableassertions> <testfailureignore>true</testfailureignore> </configuration> </plugin>

in case, project had configuration set utilize -xms10g -xmx10g. replacing lower values -xms500m -xmx1g fixed issue.

you might have similar configuration may want override locally, else adding configuration should help override default values passed intellij.

java intellij-idea junit