ExecFileLoader#save Error

[zhen da]

Hi, all ~ 

I encountered  a problem when I use  api  “ org.jacoco.core.tools.ExecFileLoader#save(java.io.File, boolean)” (jacoco v0.8.3). It throws an error like this:

java.lang.NullPointerException: null at java.util.ComparableTimSort.binarySort(ComparableTimSort.java:262) at java.util.ComparableTimSort.sort(ComparableTimSort.java:207) at java.util.Arrays.sort(Arrays.java:1312) at java.util.Arrays.sort(Arrays.java:1506) at java.util.ArrayList.sort(ArrayList.java:1464) at java.util.Collections.sort(Collections.java:143) at org.jacoco.core.data.SessionInfoStore.getInfos(SessionInfoStore.java:47) at org.jacoco.core.data.SessionInfoStore.accept(SessionInfoStore.java:84) at org.jacoco.core.tools.ExecFileLoader.save(ExecFileLoader.java:90) at org.jacoco.core.tools.ExecFileLoader.save(ExecFileLoader.java:117)

Strangely, this error does not occur each time. So is there anyone can explain the reason and how can I fix it? 

[Marc Hoffmann]

Hi,

this happens when a null value was added to the SessionInfoStore. Also please check your usage of the class: SessionInfoStore is not thread safe.

Regards,

-marc

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