[Solved] Exception: cannot be cast to java.lang.Long [closed]

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Long projectRoleSkillId = (Long) getValues().iterator().next();

This is not a Long. I assume getValues() returns an iterable of type ProjectRoleSkill.

To avoid this, instead of having

public Set<Object> getValues() {
    return new HashSet<Object>(grid.getSelectedRows());
}

you should rewrite the method signature to

public Set<ProjectRoleSkill> getValues() {
    return new HashSet<>(grid.getSelectedRows());
}

This way, the IDE won’t let you cast to Long. You’ll also then be able to see the getId() method I assume is on the ProjectRoleSkill class.

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solved Exception: cannot be cast to java.lang.Long [closed]