It appears that there may be a conflict running simple expression w/ List
under spring boot. SpringTypeConverter is registered as a fallback
converter which gets picked up during ognl while attempting to convert list
-> map causing an exception instead of a null response that is expected. It
is happening under 2.17 & 2.18. Let me know if I should submit a jira
ticket or if I am missing something here.
sample expression: ${body.list[0].field}
10:20:32.499 [main] TRACE o.a.c.i.c.DefaultTypeConverter | Converting
java.util.ArrayList -> java.util.Map
10:20:32.500 [main] TRACE o.a.c.i.c.DefaultTypeConverter | Using converter:
org.apache.camel.impl.converter.ArrayTypeConverter@79d7035 to convert [class
java.util.ArrayList=>interface java.util.Map]
Caused by: org.apache.camel.TypeConversionException: Error during type
conversion from type: java.util.ArrayList to the required type:
java.util.Map with due Failed to convert from type [java.util.ArrayList<?>]
to type [java.util.Map<?, ?>]
at
org.apache.camel.impl.converter.BaseTypeConverterRegistry.createTypeConversionException(BaseTypeConverterRegistry.java:629)
at
org.apache.camel.impl.converter.BaseTypeConverterRegistry.convertTo(BaseTypeConverterRegistry.java:150)
at
org.apache.camel.impl.converter.BaseTypeConverterRegistry.convertTo(BaseTypeConverterRegistry.java:121)
at
org.apache.camel.language.bean.BeanExpression$OgnlInvokeProcessor.lookupResult(BeanExpression.java:358)
at
org.apache.camel.language.bean.BeanExpression$OgnlInvokeProcessor.process(BeanExpression.java:334)
at
org.apache.camel.language.bean.BeanExpression.evaluate(BeanExpression.java:114)
... 55 common frames omitted
Caused by: org.springframework.core.convert.ConversionFailedException:
Failed to convert from type [java.util.ArrayList<?>] to type
[java.util.Map<?, ?>]
at
org.springframework.core.convert.support.ConversionUtils.invokeConverter(ConversionUtils.java:42)
at
org.springframework.core.convert.support.GenericConversionService.convert(GenericConversionService.java:192)
at
org.springframework.core.convert.support.GenericConversionService.convert(GenericConversionService.java:176)
at
org.apache.camel.spring.boot.SpringTypeConverter.convertTo(SpringTypeConverter.java:46)
at
org.apache.camel.impl.converter.BaseTypeConverterRegistry.doConvertTo(BaseTypeConverterRegistry.java:346)
at
org.apache.camel.impl.converter.BaseTypeConverterRegistry.convertTo(BaseTypeConverterRegistry.java:133)
... 59 common frames omitted
Dmitriy
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