While debugging in Eclipse, you can modify the code in ‘hot-swap’ mode. This feature is very convenient and effective.
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Hit a breakpoint
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Execute the code step by step to find the problem
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Modify the code directly and resume execution
 
Known restrictions.
The hot-swap feature will not work in these cases:
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Modification of the class structure (operations, methods added)
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** Modification of the operation signature
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Modification of static elements
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etc. (the list is not exhaustive)
 
In such cases, it is recommended to rebuild the module and restart a debugging session (following the process detailed in Code fixing