nullpointerexception initializing map

[oll3i]

[code=java]Map<String,Stri ng>[] rowsMap = null;
....

for(int i=0; i<numberOfRows ; i++)
rowsMap[i]= new HashMap<String, String>();
[/code]
throws nullpointerexce ption ?


thank You

[Nepomuk]

First of all: Please use the [CODE]...[/CODE] tags! You've been a member of bytes.com for long enough to know that.

About your question: Yes, it does throw a NullPointerExce ption. You're missing a [code=java]rowsMap = new Map<String,Stri ng>[numberOfRows];[/code] before that loop.

Greetings,
Nepomuk

[JosAH]

First of all: Please use the [CODE]...[/CODE] tags! You've been a member of bytes.com for long enough to know that.

About your question: Yes, it does throw a NullPointerExce ption. You're missing a [code=java]rowsMap = new Map<String,Stri ng>[numberOfRows];[/code] before that loop.

Greetings,
Nepomuk

You can't have generics in an array type; make that:

[code=java]rowsMap = new Map[numberOfRows];[/code]

kind regards,

Jos

[oll3i]

how do i suppress unchecked conversion warning in jsp in java class
@SuppressWarnin gs ("unchecked" ) works but in jsp eclipse shows a warning

[JosAH]

how do i suppress unchecked conversion warning in jsp in java class
@SuppressWarnin gs ("unchecked" ) works but in jsp eclipse shows a warning

I don't know where to put that @annotation to keep Eclipse's mouth shut in a
jsp file. Arrays and generics always have been a bit of a problem; read this.

kind regards,

Jos

ps. warnings here are harmless though; don't pay too much attention to them.

[oll3i]

thank You guys a lot i made it (hm we made it) finished everything works :) :) :)
i can have a break :)
so till the next project