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Using mockito any() throws java.lang.IllegalAccessError: class org.mockito.Matchers tried to access private method

I'm facing the exception

java.lang.IllegalAccessError: class org.mockito.Matchers tried to access private method 'void org.mockito.internal.progress.ThreadSafeMockingProgress.()' (org.mockito.Matchers and org.mockito.internal.progress.ThreadSafeMockingProgress are in unnamed module of loader 'app')

at org.mockito.Matchers.(Matchers.java:107)

when I try to use the matcher any() in mockito when() stub call. The class argument type is for "NewOrder" from the binance spot java library here

I'm trying to do

when(mockBinanceApiRestClient.newOrder(any(NewOrder.class))).thenReturn(buyOrderResp);

mocking the BinanceApiRestClient.

The any() and when() are static imports from org.mockito.Mockito.

This is such a nightmare why wouldn't it work?

Solution

  • Looks like you have two conflicting versions of Mockito on your classpath.

    ThreadSafeMockingProgress was converted to a singleton back in 2016, and its constructor was changed to private.

    On the other hand, you seem to be using org.mockito.Matchers, which was deprecated for a long while and finally removed in Mockito 4.x