I'd say one of the top ones is a blind dependency on the standard library, above and beyond many other languages. The language is structured in such a way that you basically have to rely on standard library elements whole-hog, where many other languages (including C++) would allow you to use parts-and-pieces as needed for your performance needs. Seeing as most of the standard library is deeply broken in terms of performance, this makes for some very bad messes.
Another is the terrible habit of deeply nesting multiple unnecessary namespaces. Almost every Java program I've seen has its source inside no less than six otherwise empty nested folders. Java coders often try to replicate this in C++ projects, and I have them go back and remove 85% of their namespaces.
I'll need to poke into the language again to remember a few of the others that are just beyond the reach of my immediate memory. When you do academic damage control from a language on a regular basis, you don't make a point to memorize its syntax and idiosyncrasies, for the sake of sanity. ;-)
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I'd say one of the top ones is a blind dependency on the standard library, above and beyond many other languages. The language is structured in such a way that you basically have to rely on standard library elements whole-hog, where many other languages (including C++) would allow you to use parts-and-pieces as needed for your performance needs. Seeing as most of the standard library is deeply broken in terms of performance, this makes for some very bad messes.
Another is the terrible habit of deeply nesting multiple unnecessary namespaces. Almost every Java program I've seen has its source inside no less than six otherwise empty nested folders. Java coders often try to replicate this in C++ projects, and I have them go back and remove 85% of their namespaces.
I'll need to poke into the language again to remember a few of the others that are just beyond the reach of my immediate memory. When you do academic damage control from a language on a regular basis, you don't make a point to memorize its syntax and idiosyncrasies, for the sake of sanity. ;-)