Re: [configuration] JXPathException when setting the default expression engine
Hi Nick,
you are right, this is indeed a problem in 1.10.
DefaultConfigurationBuilder extends XMLConfiguration; therefore, setting
the default expression engine affects the way keys are resolved.
The preferred way to set the expression engine for the combined
configuration produced by the builder is to declare the desired engine
in the definition file that is loaded. There is an example in the user's
guide [1] in the sub section The header section
In the upcoming version 2.0, this problem should no longer exist. Here
different mechanisms are used for setting a default expression engine
and for constructing a combined configuration. I hope that a first alpha
release of Commons Configuration 2.0 will be available soon.
So, as the problem will be solved in the next version, it probably does
not make sense to open a Jira ticket.
Oliver
[1]
http://commons.apache.org/proper/commons-configuration/userguide/howto_configurationbuilder.html#Configuration_definition_file_reference
On 11.09.2014 21:37, Nick Watts wrote:
Hello, I've run into a problem that looks to me like a bug. I thought I'd
get some input on it first though.
Here are two JUnit test cases that both pass with Commons Config 1.10:
import static org.junit.Assert.*;
import org.apache.commons.configuration.Configuration;
import org.apache.commons.configuration.ConfigurationBuilder;
import org.apache.commons.configuration.ConfigurationException;
import org.apache.commons.configuration.DefaultConfigurationBuilder;
import org.apache.commons.configuration.HierarchicalConfiguration;
import org.apache.commons.configuration.XMLConfiguration;
import org.apache.commons.configuration.tree.DefaultExpressionEngine;
import org.apache.commons.configuration.tree.xpath.XPathExpressionEngine;
import org.apache.commons.jxpath.JXPathException;
import org.junit.Before;
public class Test {
@Before
public void before() {
HierarchicalConfiguration.setDefaultExpressionEngine(new
DefaultExpressionEngine());
}
@org.junit.Test
public void testSetExpressionEngineAfterLoad() throws
ConfigurationException {
ConfigurationBuilder builder = new
DefaultConfigurationBuilder(configuration_builder.xml);
((XMLConfiguration)builder).setBasePath(src/test/resources/);
Configuration config = builder.getConfiguration();
HierarchicalConfiguration.setDefaultExpressionEngine(new
XPathExpressionEngine());
assertEquals(mail.test.org, config.getString(mail/host));
assertEquals(r...@test.org, config.getString(mail/from));
assertEquals(otheru...@test.org, config.getString(mail/to));
assertEquals(that...@test.org, config.getString(mail/cc));
assertEquals(, config.getString(mail/bcc));
}
@org.junit.Test(expected=JXPathException.class)
public void testSetExpressionEngineBeforeLoad() {
try {
HierarchicalConfiguration.setDefaultExpressionEngine(new
XPathExpressionEngine());
ConfigurationBuilder builder = new
DefaultConfigurationBuilder(configuration_builder.xml);
((XMLConfiguration)builder).setBasePath(src/test/resources/);
builder.getConfiguration();
} catch (ConfigurationException e) {
e.printStackTrace();
}
}
}
The configuration_builder.xml file:
?xml version=1.0 encoding=ISO-8859-1?
configuration
override
xml fileName=dev.config.xml config-name=env-config /
xml fileName=config.xml config-name=default-config /
/override
/configuration
the config.xml file:
?xml version=1.0 encoding=UTF-8?
config
mail
hostmail.test.org/host
fromr...@test.org/from
tonwa...@test.org/to
cc/
bcc/
/mail
/config
the dev.config.xml file:
?xml version=1.0 encoding=UTF-8?
config
mail
tootheru...@test.org/to
ccthat...@test.org/cc
/mail
/config
The possible bug is that the call to
HierarchicalConfiguration.setDefaultExpressionEngine(new
XPathExpressionEngine()) must come after the call to
builder.getConfiguration(). If it precedes builder.getConfiguration() then
you get this stack trace:
org.apache.commons.jxpath.JXPathException: Invalid XPath:
'[@systemProperties]'. Syntax error at the beginning of the expression
at org.apache.commons.jxpath.ri.Parser.parseExpression(Parser.java:60)
at
org.apache.commons.jxpath.ri.JXPathContextReferenceImpl.compileExpression(JXPathContextReferenceImpl.java:218)
at
org.apache.commons.jxpath.ri.JXPathContextReferenceImpl.iteratePointers(JXPathContextReferenceImpl.java:529)
at
org.apache.commons.jxpath.JXPathContext.selectNodes(JXPathContext.java:654)
at
org.apache.commons.configuration.tree.xpath.XPathExpressionEngine.query(XPathExpressionEngine.java:183)
at
org.apache.commons.configuration.HierarchicalConfiguration.fetchNodeList(HierarchicalConfiguration.java:958)
at
Re: [configuration] JXPathException when setting the default expression engine
Thanks for the pointer to the documentation. I missed that section somehow.
Also, I appreciate the explanation of how this problem is being resolved in
the 2.0 release. I configured the XPathExpressionEngine in the config
definition file and that solved my problem.
On Fri, Sep 12, 2014 at 9:46 AM, Oliver Heger oliver.he...@oliver-heger.de
wrote:
Hi Nick,
you are right, this is indeed a problem in 1.10.
DefaultConfigurationBuilder extends XMLConfiguration; therefore, setting
the default expression engine affects the way keys are resolved.
The preferred way to set the expression engine for the combined
configuration produced by the builder is to declare the desired engine in
the definition file that is loaded. There is an example in the user's guide
[1] in the sub section The header section
In the upcoming version 2.0, this problem should no longer exist. Here
different mechanisms are used for setting a default expression engine and
for constructing a combined configuration. I hope that a first alpha
release of Commons Configuration 2.0 will be available soon.
So, as the problem will be solved in the next version, it probably does
not make sense to open a Jira ticket.
Oliver
[1] http://commons.apache.org/proper/commons-configuration/
userguide/howto_configurationbuilder.html#Configuration_definition_file_
reference
On 11.09.2014 21:37, Nick Watts wrote:
Hello, I've run into a problem that looks to me like a bug. I thought I'd
get some input on it first though.
Here are two JUnit test cases that both pass with Commons Config 1.10:
import static org.junit.Assert.*;
import org.apache.commons.configuration.Configuration;
import org.apache.commons.configuration.ConfigurationBuilder;
import org.apache.commons.configuration.ConfigurationException;
import org.apache.commons.configuration.DefaultConfigurationBuilder;
import org.apache.commons.configuration.HierarchicalConfiguration;
import org.apache.commons.configuration.XMLConfiguration;
import org.apache.commons.configuration.tree.DefaultExpressionEngine;
import org.apache.commons.configuration.tree.xpath.XPathExpressionEngine;
import org.apache.commons.jxpath.JXPathException;
import org.junit.Before;
public class Test {
@Before
public void before() {
HierarchicalConfiguration.setDefaultExpressionEngine(new
DefaultExpressionEngine());
}
@org.junit.Test
public void testSetExpressionEngineAfterLoad() throws
ConfigurationException {
ConfigurationBuilder builder = new
DefaultConfigurationBuilder(configuration_builder.xml);
((XMLConfiguration)builder).setBasePath(src/test/resources/);
Configuration config = builder.getConfiguration();
HierarchicalConfiguration.setDefaultExpressionEngine(new
XPathExpressionEngine());
assertEquals(mail.test.org, config.getString(mail/host));
assertEquals(r...@test.org, config.getString(mail/from));
assertEquals(otheru...@test.org, config.getString(mail/to));
assertEquals(that...@test.org, config.getString(mail/cc));
assertEquals(, config.getString(mail/bcc));
}
@org.junit.Test(expected=JXPathException.class)
public void testSetExpressionEngineBeforeLoad() {
try {
HierarchicalConfiguration.setDefaultExpressionEngine(new
XPathExpressionEngine());
ConfigurationBuilder builder = new
DefaultConfigurationBuilder(configuration_builder.xml);
((XMLConfiguration)builder).setBasePath(src/test/
resources/);
builder.getConfiguration();
} catch (ConfigurationException e) {
e.printStackTrace();
}
}
}
The configuration_builder.xml file:
?xml version=1.0 encoding=ISO-8859-1?
configuration
override
xml fileName=dev.config.xml config-name=env-config /
xml fileName=config.xml config-name=default-config /
/override
/configuration
the config.xml file:
?xml version=1.0 encoding=UTF-8?
config
mail
hostmail.test.org/host
fromr...@test.org/from
tonwa...@test.org/to
cc/
bcc/
/mail
/config
the dev.config.xml file:
?xml version=1.0 encoding=UTF-8?
config
mail
tootheru...@test.org/to
ccthat...@test.org/cc
/mail
/config
The possible bug is that the call to
HierarchicalConfiguration.setDefaultExpressionEngine(new
XPathExpressionEngine()) must come after the call to
builder.getConfiguration(). If it precedes builder.getConfiguration() then
you get this stack trace:
org.apache.commons.jxpath.JXPathException: Invalid XPath:
'[@systemProperties]'. Syntax error at the beginning of the expression
at org.apache.commons.jxpath.ri.Parser.parseExpression(Parser.
java:60)
at
org.apache.commons.jxpath.ri.JXPathContextReferenceImpl.
compileExpression(JXPathContextReferenceImpl.java:218)
at
[configuration] JXPathException when setting the default expression engine
Hello, I've run into a problem that looks to me like a bug. I thought I'd
get some input on it first though.
Here are two JUnit test cases that both pass with Commons Config 1.10:
import static org.junit.Assert.*;
import org.apache.commons.configuration.Configuration;
import org.apache.commons.configuration.ConfigurationBuilder;
import org.apache.commons.configuration.ConfigurationException;
import org.apache.commons.configuration.DefaultConfigurationBuilder;
import org.apache.commons.configuration.HierarchicalConfiguration;
import org.apache.commons.configuration.XMLConfiguration;
import org.apache.commons.configuration.tree.DefaultExpressionEngine;
import org.apache.commons.configuration.tree.xpath.XPathExpressionEngine;
import org.apache.commons.jxpath.JXPathException;
import org.junit.Before;
public class Test {
@Before
public void before() {
HierarchicalConfiguration.setDefaultExpressionEngine(new
DefaultExpressionEngine());
}
@org.junit.Test
public void testSetExpressionEngineAfterLoad() throws
ConfigurationException {
ConfigurationBuilder builder = new
DefaultConfigurationBuilder(configuration_builder.xml);
((XMLConfiguration)builder).setBasePath(src/test/resources/);
Configuration config = builder.getConfiguration();
HierarchicalConfiguration.setDefaultExpressionEngine(new
XPathExpressionEngine());
assertEquals(mail.test.org, config.getString(mail/host));
assertEquals(r...@test.org, config.getString(mail/from));
assertEquals(otheru...@test.org, config.getString(mail/to));
assertEquals(that...@test.org, config.getString(mail/cc));
assertEquals(, config.getString(mail/bcc));
}
@org.junit.Test(expected=JXPathException.class)
public void testSetExpressionEngineBeforeLoad() {
try {
HierarchicalConfiguration.setDefaultExpressionEngine(new
XPathExpressionEngine());
ConfigurationBuilder builder = new
DefaultConfigurationBuilder(configuration_builder.xml);
((XMLConfiguration)builder).setBasePath(src/test/resources/);
builder.getConfiguration();
} catch (ConfigurationException e) {
e.printStackTrace();
}
}
}
The configuration_builder.xml file:
?xml version=1.0 encoding=ISO-8859-1?
configuration
override
xml fileName=dev.config.xml config-name=env-config /
xml fileName=config.xml config-name=default-config /
/override
/configuration
the config.xml file:
?xml version=1.0 encoding=UTF-8?
config
mail
hostmail.test.org/host
fromr...@test.org/from
tonwa...@test.org/to
cc/
bcc/
/mail
/config
the dev.config.xml file:
?xml version=1.0 encoding=UTF-8?
config
mail
tootheru...@test.org/to
ccthat...@test.org/cc
/mail
/config
The possible bug is that the call to
HierarchicalConfiguration.setDefaultExpressionEngine(new
XPathExpressionEngine()) must come after the call to
builder.getConfiguration(). If it precedes builder.getConfiguration() then
you get this stack trace:
org.apache.commons.jxpath.JXPathException: Invalid XPath:
'[@systemProperties]'. Syntax error at the beginning of the expression
at org.apache.commons.jxpath.ri.Parser.parseExpression(Parser.java:60)
at
org.apache.commons.jxpath.ri.JXPathContextReferenceImpl.compileExpression(JXPathContextReferenceImpl.java:218)
at
org.apache.commons.jxpath.ri.JXPathContextReferenceImpl.iteratePointers(JXPathContextReferenceImpl.java:529)
at
org.apache.commons.jxpath.JXPathContext.selectNodes(JXPathContext.java:654)
at
org.apache.commons.configuration.tree.xpath.XPathExpressionEngine.query(XPathExpressionEngine.java:183)
at
org.apache.commons.configuration.HierarchicalConfiguration.fetchNodeList(HierarchicalConfiguration.java:958)
at
org.apache.commons.configuration.AbstractHierarchicalFileConfiguration.fetchNodeList(AbstractHierarchicalFileConfiguration.java:439)
at
org.apache.commons.configuration.HierarchicalConfiguration.getProperty(HierarchicalConfiguration.java:344)
at
org.apache.commons.configuration.AbstractHierarchicalFileConfiguration.getProperty(AbstractHierarchicalFileConfiguration.java:392)
at
org.apache.commons.configuration.AbstractConfiguration.resolveContainerStore(AbstractConfiguration.java:1171)
at
org.apache.commons.configuration.AbstractConfiguration.getString(AbstractConfiguration.java:1038)
at
org.apache.commons.configuration.AbstractConfiguration.getString(AbstractConfiguration.java:1021)
at
org.apache.commons.configuration.DefaultConfigurationBuilder.initSystemProperties(DefaultConfigurationBuilder.java:793)
at
org.apache.commons.configuration.DefaultConfigurationBuilder.getConfiguration(DefaultConfigurationBuilder.java:612)
at
org.apache.commons.configuration.DefaultConfigurationBuilder.getConfiguration(DefaultConfigurationBuilder.java:587)
at
