Re: Possible to use reflection to get constructor params/args

Thomas Hawtin <>
Wed, 28 Jun 2006 17:27:37 +0100
Petterson Mikael wrote:

Is it possible to use reflection to get the param/arg names i and d in
second constructor? ( I am using jdk 1.4).

No, the information is not present in the source file.

There are a number of workarounds:

  o APT (introduced in 1.5, part of javac in 1.6) gives access to
parameter names (it works on source). For instance see:

  o Run some form of parser on your source to store the information in a
convenient format. You could use a complete parser (like APT), or add
tags within comments to the source.

  o Compile with variable name debugging enabled, and use ASM (or
similar) to read the class file.

  o Compile with line number and file name debugging. Read the
information for the constructors with either ASM or arrange for an
exception to be thrown/created (and parse the stack trace). Use a regex
to extract the information from the source (which will need to be easy
to regex). See:

Tom Hawtin
Unemployed English Java programmer

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