Spring @Value always gives an error if property is Integer

Question

I am using sprin version 4.3.8.RELEASE. also i am using @Value to inject values from property file, if the properties are string that no problem, but if the property is Integer that is a problem (i know there is many questions about this i tried all the answers but the issue still exist)

The property is

CONNECTION.TIME.OUT=100000

First solution

@Value("${CONNECTION.TIME.OUT}")
protected Integer connectionTimeOut;

Ecxeption

Failed to convert value of type 'java.lang.String' to required type 'java.lang.Integer'; nested exception is java.lang.NumberFormatException: For input string: "${CONNECTION.TIME.OUT}"

Second solution

@Value("#{new Integer('${CONNECTION.TIME.OUT}')}")
protected Integer connectionTimeOut;

Exception

EL1003E: A problem occurred whilst attempting to construct an object of type 'Integer' using arguments '(java.lang.String)'

Third solution

@Value("#{new Integer.parseInteger('${CONNECTION.TIME.OUT}')}")
protected Integer connectionTimeOut;

Exception

EL1003E: A problem occurred whilst attempting to construct an object of type 'Integer' using arguments '(java.lang.String)'

any ideas why is that

maybe related https://stackoverflow.com/questions/27106055/value-failed-to-convert-value-of-type-java-lang-string-to-required-type-j/27106543?utm_medium=organic&utm_source=google_rich_qa&utm_campaign=google_rich_qa — Zeromus, Apr 12 '18 at 10:01
While not a perfect solution, you could always get the property in a String variable and then parse it in an Integer. A simple way to do that would be to use the @Value annotation in a constructor argument and directly parse it into an integer variable in there. — jrsall92, Apr 12 '18 at 10:07

score 8 · Answer 1 · edited Jul 06 '20 at 09:33

8

To avoid such type of situation where the exception occurs due to un-availibilty of the property, Add default value in the tag. If property is not available then it will populate the default value

@Value("${CONNECTION.TIME.OUT:10}")

edited Jul 06 '20 at 09:33

giannis christofakis

8,201
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answered Apr 13 '18 at 07:23

Dhruv Raj Singh

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score 4 · Answer 2 · answered Apr 12 '18 at 10:09

Your property file is probably not loaded properly.

When provided with no valid value for a property placeholder, Spring will automatically try to assign this value to the name of the @Value annotation. In your case, this:

@Value("#{new Integer('${CONNECTION.TIME.OUT}')}")
protected Integer connectionTimeOut;

Is interpreted as:

protected Integer connectionTimeOut = new Integer("${CONNECTION.TIME.OUT}");

Which, indeed, brings an error.

Try to either configure a PropertyPlaceholderConfigurer in your beans, or make sure that your property file is loaded properly in your classpath by your configuration. Something among the lines of:

<context:property-placeholder
    ignore-unresolvable="true" 
    location="classpath:yourfile.properties" />

In your configuration file will help, in this case.

score 3 · Accepted Answer · answered Apr 12 '18 at 10:03

For @Value("${CONNECTION.TIME.OUT}") your error is java.lang.NumberFormatException: For input string: "${CONNECTION.TIME.OUT}". This means that expression was not processed resulting in Integer.parseInt("${CONNECTION.TIME.OUT}") which thrown the NumberFormatException.

Either there is no PropertyPlaceholderConfigurer bean registered in the Spring context and @Value annotations are not processed or there is no property CONNECTION.TIME.OUT defined.

score 0 · Answer 4 · edited Nov 01 '22 at 04:00

0

Try removing single quotes worked ''. It worked for me.

@Value("#{new Integer(${CONNECTION.TIME.OUT})}")

edited Nov 01 '22 at 04:00

Mustafa Poya

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answered Oct 27 '22 at 17:49

arpan agarwal

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score -1 · Answer 5 · answered Dec 10 '20 at 13:51

-1

Don't forget the "${}" around it! I kept looking at what should have been obvious and missing it.

answered Dec 10 '20 at 13:51

Michael

1,177
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Spring @Value always gives an error if property is Integer

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