安装好jbuilder2005后，点击启动，2005的启动界面一闪后便再无动静，进入F:\Borland\JBuilder2005\bin\JBuilder.exe路径，在cmd中运行JBuilder，报错：
F:\Borland\JBuilder2005\bin>jbuilder
Error occurred during initialization of VM
Could not reserve enough space for object heap
初步估计是jvm定义值过大，在F:\Borland\JBuilder2005\bin下查看，发现有2个配置文件，一个是jbuilder.config，一个是jdk.config，打开后发现在jbuilder.config中有如下有关jvm的定义：
# Tune this VM to provide enough headroom to work on large
# applications
vmmemmin 32m
vmmemmax 75%
将其改为
vmmemmin 32m
vmmemmax 512
重新启动ok，问题解决。