Eric Spishak created SOLR-3446:
----------------------------------
Summary: PatternSyntaxException Crash from Unvalidated Regular
Expression Usage
Key: SOLR-3446
URL: https://issues.apache.org/jira/browse/SOLR-3446
Project: Solr
Issue Type: Bug
Affects Versions: 3.5
Reporter: Eric Spishak
Attachments: SOLR-3446.patch
Solr sometimes crashes with an unhelpful stack trace. If the
PatternTokenizerFactory's "pattern" attribute is set to an invalid regular
expression, a PatternSyntaxException is thrown and Solr fails to start. The
PatternSyntaxException is not useful to users in diagnosing the error. I think
it would be better to report a detailed error message. The attached patch makes
this change.
Note that the patch adds a small RegexUtil class with helper methods to
determine whether a String is a valid regular expression and to generate error
messages for invalid regular expressions. I feel that these helper methods are
more readable than catching the PatternSyntaxException. Furthermore, they can
be re-used if more bugs like this one are found.
Steps to reproduce:
# Patch in bug.patch
#* Note that this sets PatternTokenizerFactory's pattern attribute to an
invalid regular expression.
# Run 'ant run-example' from the solr folder
# See exception in console output on startup:
{code}
Apr 3, 2012 2:07:29 PM org.apache.solr.common.SolrException log
SEVERE: java.util.regex.PatternSyntaxException: Unclosed group near index 1
(
^
at java.util.regex.Pattern.error(Pattern.java:1713)
at java.util.regex.Pattern.accept(Pattern.java:1571)
at java.util.regex.Pattern.group0(Pattern.java:2533)
at java.util.regex.Pattern.sequence(Pattern.java:1806)
at java.util.regex.Pattern.expr(Pattern.java:1752)
at java.util.regex.Pattern.compile(Pattern.java:1460)
at java.util.regex.Pattern.<init>(Pattern.java:1133)
at java.util.regex.Pattern.compile(Pattern.java:847)
at
org.apache.solr.analysis.PatternTokenizerFactory.init(PatternTokenizerFactory.java:90)
at org.apache.solr.schema.IndexSchema$5.init(IndexSchema.java:901)
at org.apache.solr.schema.IndexSchema$5.init(IndexSchema.java:890)
at
org.apache.solr.util.plugin.AbstractPluginLoader.load(AbstractPluginLoader.java:148)
at org.apache.solr.schema.IndexSchema.readAnalyzer(IndexSchema.java:910)
at org.apache.solr.schema.IndexSchema.access$100(IndexSchema.java:62)
at org.apache.solr.schema.IndexSchema$1.create(IndexSchema.java:450)
at org.apache.solr.schema.IndexSchema$1.create(IndexSchema.java:435)
at
org.apache.solr.util.plugin.AbstractPluginLoader.load(AbstractPluginLoader.java:140)
at org.apache.solr.schema.IndexSchema.readSchema(IndexSchema.java:480)
at org.apache.solr.schema.IndexSchema.<init>(IndexSchema.java:125)
at org.apache.solr.core.CoreContainer.create(CoreContainer.java:461)
at org.apache.solr.core.CoreContainer.load(CoreContainer.java:316)
at org.apache.solr.core.CoreContainer.load(CoreContainer.java:207)
at
org.apache.solr.core.CoreContainer$Initializer.initialize(CoreContainer.java:130)
at
org.apache.solr.servlet.SolrDispatchFilter.init(SolrDispatchFilter.java:94)
at org.mortbay.jetty.servlet.FilterHolder.doStart(FilterHolder.java:97)
at
org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:50)
at
org.mortbay.jetty.servlet.ServletHandler.initialize(ServletHandler.java:713)
at org.mortbay.jetty.servlet.Context.startContext(Context.java:140)
at
org.mortbay.jetty.webapp.WebAppContext.startContext(WebAppContext.java:1282)
at
org.mortbay.jetty.handler.ContextHandler.doStart(ContextHandler.java:518)
at org.mortbay.jetty.webapp.WebAppContext.doStart(WebAppContext.java:499)
at
org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:50)
at
org.mortbay.jetty.handler.HandlerCollection.doStart(HandlerCollection.java:152)
at
org.mortbay.jetty.handler.ContextHandlerCollection.doStart(ContextHandlerCollection.java:156)
at
org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:50)
at
org.mortbay.jetty.handler.HandlerCollection.doStart(HandlerCollection.java:152)
at
org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:50)
at
org.mortbay.jetty.handler.HandlerWrapper.doStart(HandlerWrapper.java:130)
at org.mortbay.jetty.Server.doStart(Server.java:224)
at
org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:50)
at org.mortbay.xml.XmlConfiguration.main(XmlConfiguration.java:985)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.mortbay.start.Main.invokeMain(Main.java:194)
at org.mortbay.start.Main.start(Main.java:534)
at org.mortbay.start.Main.start(Main.java:441)
at org.mortbay.start.Main.main(Main.java:119)
{code}
4. Visit http://localhost:8983/solr/admin/ and see a similar message:
{code}
HTTP ERROR 500
Problem accessing /solr/admin/. Reason:
Severe errors in solr configuration.
Check your log files for more detailed information on what may be wrong.
If you want solr to continue after configuration errors, change:
<abortOnConfigurationError>false</abortOnConfigurationError>
in solr.xml
...
-------------------------------------------------------------
java.util.regex.PatternSyntaxException: Unclosed group near index 1
(
^
at java.util.regex.Pattern.error(Pattern.java:1713)
at java.util.regex.Pattern.accept(Pattern.java:1571)
at java.util.regex.Pattern.group0(Pattern.java:2533)
at java.util.regex.Pattern.sequence(Pattern.java:1806)
at java.util.regex.Pattern.expr(Pattern.java:1752)
at java.util.regex.Pattern.compile(Pattern.java:1460)
at java.util.regex.Pattern.<init>(Pattern.java:1133)
at java.util.regex.Pattern.compile(Pattern.java:847)
at
org.apache.solr.analysis.PatternTokenizerFactory.init(PatternTokenizerFactory.java:90)
at org.apache.solr.schema.IndexSchema$5.init(IndexSchema.java:901)
at org.apache.solr.schema.IndexSchema$5.init(IndexSchema.java:890)
at
org.apache.solr.util.plugin.AbstractPluginLoader.load(AbstractPluginLoader.java:148)
...
{code}
After applying the patch, the following is printed to the console:
{code}
SEVERE: org.apache.solr.common.SolrException: invalid "pattern" regular
expression for PatternTokenizerFactory: Unclosed group near index 1
(
^
at
org.apache.solr.analysis.PatternTokenizerFactory.init(PatternTokenizerFactory.java:90)
at org.apache.solr.schema.IndexSchema$5.init(IndexSchema.java:901)
at org.apache.solr.schema.IndexSchema$5.init(IndexSchema.java:890)
at
org.apache.solr.util.plugin.AbstractPluginLoader.load(AbstractPluginLoader.java:148)
...
{code}
And the following similar message is shown when visiting
http://localhost:8983/solr/admin/ :
{code}
HTTP ERROR 500
Problem accessing /solr/admin/. Reason:
Severe errors in solr configuration.
Check your log files for more detailed information on what may be wrong.
If you want solr to continue after configuration errors, change:
<abortOnConfigurationError>false</abortOnConfigurationError>
in solr.xml
...
-------------------------------------------------------------
org.apache.solr.common.SolrException: invalid "pattern" regular expression for
PatternTokenizerFactory: Unclosed group near index 1
(
^
at
org.apache.solr.analysis.PatternTokenizerFactory.init(PatternTokenizerFactory.java:90)
at org.apache.solr.schema.IndexSchema$5.init(IndexSchema.java:901)
at org.apache.solr.schema.IndexSchema$5.init(IndexSchema.java:890)
at
org.apache.solr.util.plugin.AbstractPluginLoader.load(AbstractPluginLoader.java:148)
...
{code}
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