Piotr Skowronek created CONFIGURATION-677:
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Summary: FileBasedConfigurationBuilder allowFailOnInit vs
HomeDirectoryLocationStrategy
Key: CONFIGURATION-677
URL: https://issues.apache.org/jira/browse/CONFIGURATION-677
Project: Commons Configuration
Issue Type: Bug
Components: Documentation, File reloading
Affects Versions: 2.2
Environment: MacOS Sierra 10.12.6, Java 1.8.0_152
Reporter: Piotr Skowronek
Fix For: 2.x
It seems there's a problem with configuration creation when using
FileBasedConfigurationBuilder with allowFailOnInit together with
HomeDirectoryLocationStrategy and autoSave option.
If the configuration is present in user.home directory (let's say
~/.some.config) it is being loaded and updated properly, but if the file does
*not exist* then the configuration is created in current working directory
(where the java program was launched) and *not* in user home directory.
Javadoc of BasicConfigurationBuilder states as follow:
{quote}A builder instance can be constructed with an <em>allowFailOnInit</em>
* flag. If set to <strong>true</strong>, exceptions during initialization
* of the configuration are ignored; in such a case an empty configuration
* object is returned. A use case for this flag is a scenario in which a
* configuration is optional and created on demand the first time configuration
* data is to be stored. Consider an application that stores user-specific
* configuration data in the user's home directory: When started for the first
* time by a new user there is no configuration file; so it makes sense to
* start with an empty configuration object. On application exit, settings
* can be stored in this object and written to the associated file. Then they
* are available on next application start.
{quote}
So, either it is a bug and it should be fixed in the Configuration project or
it is the correct behavior and it is the programmer to ensure to write the
configuration in the right place for the first time. If the latter then I would
suggest to update javadoc to state that clearly enough (and maybe provide an
example on the project website).
Code sample:
{code}
// file not present: ~/.some.config
BuilderParameters params = new
Parameters().properties().setFileName(".some.config")
.setLocationStrategy(new HomeDirectoryLocationStrategy());
builder = new
FileBasedConfigurationBuilder<FileBasedConfiguration>(PropertiesConfiguration.class,
params.getParameters(), true);
builder.setAutoSave(true);
config = builder.getConfiguration();
config.setProperty("test", "test);
// config file .some.config not present in ~/.some.config but present
in CWD
{code}
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