It looks like you are trying to run JBT with Java 1.5, instead of Java
1.6. In the /docs directory, there is a file
JBookTraderSetup.Mac.Eclipse.pdf which specifies the instructions on
setting up and running JBT on MacOS.

On Nov 5, 1:42 pm, JJ <[email protected]> wrote:
> I downloaded JBookTrader-7.04.zip onto my Mac running OS X 10. I ran
> JBookTrader.sh and I get the following error:
>
> source/com/jbooktrader/platform/strategy/Strategy.java:27: cannot
> access com.ib.client.Contract
> bad class file: /Users/tc/JBookTrader-7.04/lib/ibapi-9.62.jar(com/ib/
> client/Contract.class)
> class file has wrong version 50.0, should be 49.0
> Please remove or make sure it appears in the correct subdirectory of
> the classpath.
>     private Contract contract;
>             ^
> 1 error
>
> Looks like the Contract class is the incorrect version in
> ibapi-9.62.jar. Is there a fix available?
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