mayur mohan created CAMEL-24510:
-----------------------------------
Summary: ExchangeHelper.convertToType throws NPE when
CamelContext.getTypeConverter() is null during shutdown
Key: CAMEL-24510
URL: https://issues.apache.org/jira/browse/CAMEL-24510
Project: Camel
Issue Type: Bug
Reporter: mayur mohan
h2. Problem
When a typed {{exchange.getProperty(name, Class)}} is called and the stored
value requires type conversion, {{ExchangeHelper.convertToType()}} calls
{{exchange.getContext().getTypeConverter().convertTo(...)}}. If
{{getTypeConverter()}} returns {{null}} (e.g. during CamelContext shutdown,
OSGi bundle refresh, or context not fully initialized), a bare
{{NullPointerException}} is thrown with no actionable message.
h2. Root Cause
File:
{{core/camel-support/src/main/java/org/apache/camel/support/ExchangeHelper.java}}
{code:java}
public static <T> T convertToType(Exchange exchange, Class<T> type, Object
value)
throws TypeConversionException {
return exchange.getContext().getTypeConverter().convertTo(type, exchange,
value);
}
{code}
No null check on the result of {{getTypeConverter()}}. Typical situations where
{{getTypeConverter()}} is null:
* CamelContext stopping or restarting while a Quartz poll still runs
* OSGi / Blueprint bundle refresh
* Exchange created or copied without a fully initialized context
* Type converter registry already cleared during shutdown
h2. Stack Trace
{noformat}
java.lang.NullPointerException: Cannot invoke
"org.apache.camel.TypeConverter.convertTo(java.lang.Class,
org.apache.camel.Exchange, Object)"
because the return value of
"org.apache.camel.CamelContext.getTypeConverter()" is null
at
org.apache.camel.support.ExchangeHelper.convertToType(ExchangeHelper.java:261)
at
org.apache.camel.support.AbstractExchange.getProperty(AbstractExchange.java:321)
at
org.apache.camel.support.DefaultExchange.getProperty(DefaultExchange.java:27)
at
com.sap.esb.camel.ftp.sap.sftp.component.SapSftpConsumer.isStopOnExceptionEnabled(SapSftpConsumer.java:189)
at
com.sap.esb.camel.ftp.sap.sftp.component.SapSftpConsumer.processBatch(SapSftpConsumer.java:172)
at
org.apache.camel.component.file.GenericFileConsumer.poll(GenericFileConsumer.java:206)
at
com.sap.esb.camel.ftp.sap.sftp.component.SapSftpConsumer.poll(SapSftpConsumer.java:134)
at
org.apache.camel.support.ScheduledPollConsumer.doRun(ScheduledPollConsumer.java:202)
at
org.apache.camel.support.ScheduledPollConsumer.run(ScheduledPollConsumer.java:116)
at
org.apache.camel.pollconsumer.quartz.QuartzScheduledPollConsumerJob.execute(QuartzScheduledPollConsumerJob.java:61)
at org.quartz.core.JobRunShell.run(JobRunShell.java:202)
at
org.quartz.simpl.SimpleThreadPool$WorkerThread.run(SimpleThreadPool.java:573)
{noformat}
h2. Fix
Add null guards in both {{convertToType}} and {{convertToMandatoryType}},
throwing a descriptive {{IllegalStateException}} instead of a bare NPE:
{code:java}
public static <T> T convertToType(Exchange exchange, Class<T> type, Object
value)
throws TypeConversionException {
if (value == null) { return null; }
if (type != null && type.isInstance(value)) { return type.cast(value); }
CamelContext ctx = exchange != null ? exchange.getContext() : null;
TypeConverter converter = ctx != null ? ctx.getTypeConverter() : null;
if (converter == null) {
throw new IllegalStateException(
"Cannot convert from " + value.getClass().getName() + " to " +
type.getName()
+ " because CamelContext type converter is not available"
+ " (context not started, stopped, or not initialized)");
}
return converter.convertTo(type, exchange, value);
}
{code}
h2. Before / After
*Before:*
{noformat}
NullPointerException: Cannot invoke "TypeConverter.convertTo(...)" because the
return value of "CamelContext.getTypeConverter()" is null
{noformat}
*After:*
{noformat}
IllegalStateException: Cannot convert from java.lang.String to
java.lang.Boolean because CamelContext type converter is not available (context
not started, stopped, or not initialized)
{noformat}
h2. PR
https://github.com/apache/camel/pull/TBD
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