ClassNotFound (class is there in EAR file)

Question

I have an EAR file. It gives me ClassNotFound error even though I have checked
that the class is there in the EAR at right place. This happens with one particular
server. Same EAR file when deployed on another instance gives no problem.
Can it happen if a class is fould at two different locations in classpath at runtime?
Thanks in advance

Answer 1

SquareBox wrote:
user8483670 wrote:
To handle String data like you said the one "Hello world" we can use string Buffer or StringBuilder for that purpose? why only String?I'm NOT 100% sure about this but I'm pretty sure. Anytime you create a String, the Java compiler uses StringBuilder.No, that's definitely not the case.
Perhaps what you're thinking of is that when you concatenate non-compile-time-constant Strings, the compiler generates StringBuilder.append() calls.
That is why when you want to use an array to create Strings for each element, it is better to explicitly call the StringBuilder because otherwise Java will create a new StringBuilder for every single element. In this case if you create a StringBuilder explicitly, then Java would only have to do it once rather than for each element of the array. This would slow down the program for large arrays.Sort of. Arrays don't specifically have anything to do with it. They're just one specific case. The real issue is when doing a lot of concatenations in a loop, you want to explicitly user StringBuilder, to avoid creating (and having to GC) large numbers of temporary String and StringBuilder objects.
String s1 = "abc" + x "def" + y + "zzz";The above is fine, because the compiler can insert the creation of a single StringBuilder.
String s1 = "";
loop {
  s1 += something;
}The above is not good, because for every pass through the loop, there will be a StringBuilder and a String created, and eligible for GC.
StringBuilder sb = new StringBuilder();
loop {
  sb.append(something);
}The above is the preferred way to do it. Although in practice, in the majority of cases you probably won't even notice the difference.
Edited by: jverd on Mar 8, 2011 9:44 AM