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Joshua Bloch Debuggers are nice and there are times when I would have used a print statement, but instead use a breakpoint. So yes, I use debuggers occasionally, but I don t feel lost without them, either. So long as I can put print statements in the code, and can read it thoroughly, I can usually find the bugs. As I said, I use assertions to make sure that complicated invariants are maintained. If invariants are corrupted, I want to know the instant it happens; I want to know what set of actions caused the corruption to take place. That reminds me of another very difficult-to-find bug. My memory of this one is a bit hazy; either it happened at Transarc or when I was a grad student at CMU, working on the Camelot distributed transaction system. I wasn t the one who found this one, but it sure made an impression on me. We had a trace package that allowed code to emit debugging information. Each trace event was tagged with the ID of the thread that emitted it. Occasionally we were getting incorrect thread IDs in the logs, and we had no idea why. We just decided that we could live with the bug for a while. It seemed innocuous enough. It turned out that the bug wasn t in the trace package at all: it was much more serious. To find the thread ID, the trace package called into the threading package. To get the thread ID, the threading package used a trick that was fairly common at the time: it looked at some high-order bits of the address of a stack variable. In other words, it took a pointer to a stack variable, shifted it to the right by a fixed distance, and that was the thread ID. This trick depends on the fact that each thread has a fixed-size stack whose size is a well-known power of two. Seems like a reasonable approach, right Except that people who didn t know any better were creating objects on the stack that were, by the standards of the day, very big. Perhaps arrays of 100 elements, each 4k in size so you ve got 400k slammed onto your thread stack. You jump right over the stack s red zone and into the next thread s stack. Now the threadID method misidentifies the thread. Worse, when the thread accesses thread-local variables, it gets the next thread s values, because the thread ID was used as the key to the thread-local variables.
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Joshua Bloch So what we took to be a minor flaw in the tracing system was actually evidence of a really serious bug. When an event was attributed to thread-43 instead of thread-42, it was because thread-42 was now unintentionally impersonating thread-43, with potentially disastrous consequences. This is an example of why you need safe languages. This is just not something that anyone should ever have to cope with. I was talking to someone recently at a university who asked me what I thought about the fact that his university wanted to teach C and C++ first and then Java, because they thought that programmers should understand the system all the way down. I think the premise is right but the conclusion is wrong. Yes, students should learn low-level languages. In fact, they should learn assembly language, and even chip architecture. Though chips have turned into to these unbelievable complicated beasts where even the chips don t have good performance models anymore because of the fact that they are such complicated state machines. But they ll be much better high-level language programmers if they understand what s going on in the lower layers of the system. So yes, I think it s important that you learn all this stuff. But do I think you should start with a low-level language like C No! Students should not have to deal with buffer overruns, manual memory allocation, and the like in their first exposure to programming. James Gosling once said to me, discussing the birth of Java, Occasionally you get to hit the reset button. That s one of the most marvelous things that can happen. Usually, you have to maintain compatibility with stuff that s decades old; rarely, you don t, and it s great when that happens. But unfortunately, as you can see with Java, it only takes you a decade until you re the problem. Seibel: Since you say that, is Java off in the weeds a little bit Is it getting more complex faster than it s getting better Bloch: That s a very difficult question. In particular, the Java 5 changes added far more complexity than we ever intended. I had no understanding of just how much complexity generics and, in particular, wildcards were
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