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Editorial Team
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Asked: 2026-05-18T21:10:15+00:00

I’m trying Guice. I made a simple example which is very similar to the

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I’m trying Guice. I made a simple example which is very similar to the example in the Guice Getting Started manual.

But it didn’t work for some time and said:

Could not find a suitable constructor
in mypack.ServiceUser. Classes must
have either one (and only one)
constructor annotated with @Inject or
a zero-argument constructor that is
not private. at
mypack.ServiceUser.class(ServiceUser.java:14)
while locating mypack.ServiceUser

The problem was in imports. I attached both Google Guice and TestNG to the project. And I imported classes from org.testng.guice package. But annotation Inject was imported from the javax.inject package. After I changed that import to org.testng.guice.Inject my program began working.

But after that I played with imports a little more. And I changed all org.testng imports to com.google.inject. The program still worked. After that I went back to the @Inject annotation and changed its import to javax.inject.Inject (as it was in my very first broken version). And the program worked even after that.

I checked ones again: Guice from TestNG packages doesn’t work with javax.inject.Inject while Guice from google packages (com.google.inject) works normally with it.

Why is it so weird?

p.s. I use last versions of both Guice and TestNG (guice-3.0-rc1 and testng-5.14.5).

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1 Answer

  1. Editorial Team

    The short answer is: @Guice is still a work in progress and being designed on the mailing-list as we speak, so it’s still experimental.

    Also, you are using undocumented packages that are reserved for TestNG’s internal use (org.testng.guice).

    I pushed a new version just today, you can download it at http://testng.org/beta

    Note that this new version no longer has org.testng.guice, so make sure that whenever you need Guice symbols, you import them from com.google.inject.

    Please post on the testng-users mailing-list if you have any more questions/concerns.

    Thanks.

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