https://issues.apache.org/bugzilla/show_bug.cgi?id=51654
Bug #: 51654
Summary: NullPointerException in startup
(org.apache.catalina.startup.HostConfig.filterAppPaths
) due to missing app base
Product: Tomcat 7
Version: unspecified
Platform: PC
OS/Version: Linux
Status: NEW
Severity: normal
Priority: P2
Component: Catalina
AssignedTo: dev@tomcat.apache.org
ReportedBy: d.tonho...@m-plify.com
Classification: Unclassified
A hard-to-diagnose NullPointerException at startup which can be bettered with
an appropriate error message:
INFO: Starting Servlet Engine: Apache Tomcat/7.0.19
java.lang.NullPointerException
at org.apache.catalina.startup.HostConfig.filterAppPaths(HostConfig.java:493)
at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:466)
at org.apache.catalina.startup.HostConfig.start(HostConfig.java:1322)
at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:311)
at
org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:119)
at
org.apache.catalina.util.LifecycleBase.fireLifecycleEvent(LifecycleBase.java:89)
Ok, what's this about?
In "protected String[] filterAppPaths(String[] unfilteredAppPaths)"
the exception is raised at
for (String appPath : unfilteredAppPaths)
Which means the "unfilteredAppPaths" passed in is null. filterAppPaths does not
check for that (shouldn't there be an assertion at least)
The problems comes from "deployApps()":
protected void deployApps() {
File appBase = appBase();
File configBase = configBase();
String[] filteredAppPaths = filterAppPaths(appBase.list()); <----
// Deploy XML descriptors from configBase
deployDescriptors(configBase, configBase.list());
// Deploy WARs, and loop if additional descriptors are found
deployWARs(appBase, filteredAppPaths);
// Deploy expanded folders
deployDirectories(appBase, filteredAppPaths);
}
Where "appBase.list()" returns null. This must be because "appBase" does not
actually denote a directory (A-HA!)
Indeed, the server.xml points to a nonexisting appBase.
Suggesting to add a check to "deployApps":
protected void deployApps() {
File appBase = appBase();
File configBase = configBase();
if (!appBase.exists() || appBase.list()==null) {
throw new IllegalArgumentException("The appBase " + appBase + "
does not exist or cannot be listed");
}
String[] filteredAppPaths = filterAppPaths(appBase.list()); <----
// Deploy XML descriptors from configBase
deployDescriptors(configBase, configBase.list());
// Deploy WARs, and loop if additional descriptors are found
deployWARs(appBase, filteredAppPaths);
// Deploy expanded folders
deployDirectories(appBase, filteredAppPaths);
}
This probably violates some I18N requirement though.
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