Read comma separated properties with configuration2 in java

java comma
n savoini picture n savoini · Apr 22, 2016 · Viewed 11.7k times · Source

I have this property: 

move.patternfile.include = *1a.txt,*2a.txt

and I'm trying to put it in a list, using Apache commons configuration2.

The code I have is :

Configurations configs = new Configurations();
AbstractConfiguration config = configs.properties(new File(fileName));
config.setListDelimiterHandler(new DefaultListDelimiterHandler(','));

I can read all the others properties, but the one I want is still a 1 size list.

This is the command to retrieve the values :

List<String> linclude = configuration.getList(String.class, "patternfile.include");

Can you help please?

Answer

D.B. picture D.B. · Jun 26, 2016

Based on this it appears that the delimiter has to be set before the properties are read from the file. The code below works when I run it, but generates a warning.

Parameters params = new Parameters();
FileBasedConfigurationBuilder<PropertiesConfiguration> builder =
     new FileBasedConfigurationBuilder<PropertiesConfiguration>(
             PropertiesConfiguration.class).configure(params.fileBased()
             .setListDelimiterHandler(new DefaultListDelimiterHandler(','))
             .setFile(new File("test.properties")));
PropertiesConfiguration config = builder.getConfiguration();

List<String> linclude = config.getList(String.class, "patternfile.include");

System.out.println(linclude.size());
for(String item: linclude){
    System.out.println(item);
}

test.properties

patternfile.include = *1a.txt,*2a.txt

Output

2

*1a.txt

*2a.txt

Here is the warning I see when I run it: 

Jun 26, 2016 2:12:17 AM org.apache.commons.beanutils.FluentPropertyBeanIntrospector introspect
WARNING: Error when creating PropertyDescriptor for public final void org.apache.commons.configuration2.AbstractConfiguration.setProperty(java.lang.String,java.lang.Object)! Ignoring this property.
java.beans.IntrospectionException: bad write method arg count: public final void org.apache.commons.configuration2.AbstractConfiguration.setProperty(java.lang.String,java.lang.Object)
    at java.beans.PropertyDescriptor.findPropertyType(Unknown Source)
    at java.beans.PropertyDescriptor.setWriteMethod(Unknown Source)
    at java.beans.PropertyDescriptor.<init>(Unknown Source)
    at org.apache.commons.beanutils.FluentPropertyBeanIntrospector.createFluentPropertyDescritor(FluentPropertyBeanIntrospector.java:177)
    at org.apache.commons.beanutils.FluentPropertyBeanIntrospector.introspect(FluentPropertyBeanIntrospector.java:140)
    at org.apache.commons.beanutils.PropertyUtilsBean.fetchIntrospectionData(PropertyUtilsBean.java:2234)
    at org.apache.commons.beanutils.PropertyUtilsBean.getIntrospectionData(PropertyUtilsBean.java:2215)
    at org.apache.commons.beanutils.PropertyUtilsBean.getPropertyDescriptor(PropertyUtilsBean.java:950)
    at org.apache.commons.beanutils.PropertyUtilsBean.isWriteable(PropertyUtilsBean.java:1466)
    at org.apache.commons.configuration2.beanutils.BeanHelper.isPropertyWriteable(BeanHelper.java:521)
    at org.apache.commons.configuration2.beanutils.BeanHelper.initProperty(BeanHelper.java:357)
    at org.apache.commons.configuration2.beanutils.BeanHelper.initBeanProperties(BeanHelper.java:273)
    at org.apache.commons.configuration2.beanutils.BeanHelper.initBean(BeanHelper.java:192)
    at org.apache.commons.configuration2.beanutils.BeanHelper$BeanCreationContextImpl.initBean(BeanHelper.java:669)
    at org.apache.commons.configuration2.beanutils.DefaultBeanFactory.initBeanInstance(DefaultBeanFactory.java:162)
    at org.apache.commons.configuration2.beanutils.DefaultBeanFactory.createBean(DefaultBeanFactory.java:116)
    at org.apache.commons.configuration2.beanutils.BeanHelper.createBean(BeanHelper.java:459)
    at org.apache.commons.configuration2.beanutils.BeanHelper.createBean(BeanHelper.java:479)
    at org.apache.commons.configuration2.beanutils.BeanHelper.createBean(BeanHelper.java:492)
    at org.apache.commons.configuration2.builder.BasicConfigurationBuilder.createResultInstance(BasicConfigurationBuilder.java:447)
    at org.apache.commons.configuration2.builder.BasicConfigurationBuilder.createResult(BasicConfigurationBuilder.java:417)
    at org.apache.commons.configuration2.builder.BasicConfigurationBuilder.getConfiguration(BasicConfigurationBuilder.java:285)
    at main.Main.main(Main.java:25)

I found this link regarding this warning message.

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