Generate random values in your properties - Spring Boot

During some configurations with Kafka, I was at a point where I need a different group id for each instance of the same service.

So to set up it, I looked for how I can make prefixed group ids. And I found this.

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In your application.properties or in your application.yaml, you can use the next functions to generate random values.

# Random int
a=${random.int}

# Random int with a maximum value
b=${random.int(1000)}

# Random int in a range
c=${random.int[0, 9999])} 

# Random long with a maximum value
d=${random.long(100000000000000000)}

# Random long in a range
e=${random.long[10000, 999999999999999999])}

# Random 32 bytes value
f=${random.value}

# Random UUID
g=${random.uuid}

And if you want, you can use them in the middle of a string.

h=test-${random.int}-value

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I hope it will help you!

Don't hesitate to give some feedback to help me to improve my writing skills. Thanks!

Comments

[Bruno Zani]

Very interesting tip, thanks for sharing.

[Shrikant]

Below are corrected values for range.

# Random int in a range
c=${random.int[0, 9999]} 

# Random long in a range
e=${random.long[10000, 999999999999999999]}

[mnmpeterson]

I couldn't get the range examples to work . . . even after adding the missing left parentheses.

[Maxime Guilbert]

Did you add it in your applilcationn.yaml file?