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https://issues.apache.org/jira/browse/CAMEL-10548?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Luca Burgazzoli updated CAMEL-10548:
------------------------------------
Fix Version/s: 2.18.2
> Converter from List to String is not found when @EnableAutoConfiguration is
> used
> --------------------------------------------------------------------------------
>
> Key: CAMEL-10548
> URL: https://issues.apache.org/jira/browse/CAMEL-10548
> Project: Camel
> Issue Type: Bug
> Components: camel-spring-boot
> Reporter: Luca Burgazzoli
> Assignee: Luca Burgazzoli
> Fix For: 2.18.2, 2.19.0
>
>
> This very simple spring-boot application :
> {code:java}
> @SpringBootApplication
> public class Application {
> public static void main(String[] args) {
> SpringApplication.run(Application.class, args);
> }
> @Component
> public class MyRouteBuilder extends RouteBuilder {
> @Override
> public void configure() throws Exception {
> from("timer:person")
> .setBody().constant(Arrays.asList(
> new Person("Peter", 25),
> new Person("John", 33)
> ))
> .log("Body is ${body}");
> }
> }
> public static class Person {
> private String name;
> private int age;
> public Person(String name, int age) {
> this.name = name;
> this.age = age;
> }
> public String getName() {
> return name;
> }
> public void setName(String name) {
> this.name = name;
> }
> public int getAge() {
> return age;
> }
> public void setAge(int age) {
> this.age = age;
> }
> @Override
> public String toString() {
> return "Person{" +
> "name='" + name + '\'' +
> ", age=" + age +
> '}';
> }
> }
> }
> {code}
> Fails to resolve the simple expression ${body} because of the following
> exception:
> {code}
> org.apache.camel.TypeConversionException: Error during type conversion from
> type: java.lang.String to the required type: java.lang.String with value
> [Person{name='Peter', age=25}, Person{name='John', age=33}] due Failed to
> convert from type [java.util.Arrays$ArrayList<?>] to type [java.lang.String]
> for value '[Person{name='Peter', age=25}, Person{name='John', age=33}]';
> nested exception is
> org.springframework.core.convert.ConverterNotFoundException: No converter
> found capable of converting from type [java.util.Arrays$ArrayList<?>] to type
> [java.lang.String]
> at
> org.apache.camel.impl.converter.BaseTypeConverterRegistry.createTypeConversionException(BaseTypeConverterRegistry.java:629)
> ~[camel-core-2.18.0.jar:2.18.0]
> at
> org.apache.camel.impl.converter.BaseTypeConverterRegistry.convertTo(BaseTypeConverterRegistry.java:150)
> ~[camel-core-2.18.0.jar:2.18.0]
> at
> org.apache.camel.support.ExpressionAdapter.evaluate(ExpressionAdapter.java:41)
> ~[camel-core-2.18.0.jar:2.18.0]
> at
> org.apache.camel.builder.ExpressionBuilder$75.evaluate(ExpressionBuilder.java:1795)
> ~[camel-core-2.18.0.jar:2.18.0]
> at
> org.apache.camel.support.ExpressionAdapter.evaluate(ExpressionAdapter.java:36)
> ~[camel-core-2.18.0.jar:2.18.0]
> at
> org.apache.camel.processor.LogProcessor.process(LogProcessor.java:53)
> ~[camel-core-2.18.0.jar:2.18.0]
> at
> org.apache.camel.management.InstrumentationProcessor.process(InstrumentationProcessor.java:77)
> ~[camel-core-2.18.0.jar:2.18.0]
> at
> org.apache.camel.processor.RedeliveryErrorHandler.process(RedeliveryErrorHandler.java:542)
> ~[camel-core-2.18.0.jar:2.18.0]
> at
> org.apache.camel.processor.CamelInternalProcessor.process(CamelInternalProcessor.java:197)
> [camel-core-2.18.0.jar:2.18.0]
> at org.apache.camel.processor.Pipeline.process(Pipeline.java:120)
> ~[camel-core-2.18.0.jar:2.18.0]
> at org.apache.camel.processor.Pipeline.process(Pipeline.java:83)
> ~[camel-core-2.18.0.jar:2.18.0]
> at
> org.apache.camel.processor.CamelInternalProcessor.process(CamelInternalProcessor.java:197)
> [camel-core-2.18.0.jar:2.18.0]
> at
> org.apache.camel.component.timer.TimerConsumer.sendTimerExchange(TimerConsumer.java:192)
> [camel-core-2.18.0.jar:2.18.0]
> at
> org.apache.camel.component.timer.TimerConsumer$1.run(TimerConsumer.java:76)
> [camel-core-2.18.0.jar:2.18.0]
> at java.util.TimerThread.mainLoop(Timer.java:555) [na:1.8.0_112]
> at java.util.TimerThread.run(Timer.java:505) [na:1.8.0_112]
> Caused by: org.springframework.core.convert.ConversionFailedException: Failed
> to convert from type [java.util.Arrays$ArrayList<?>] to type
> [java.lang.String] for value '[Person{name='Peter', age=25},
> Person{name='John', age=33}]'; nested exception is
> org.springframework.core.convert.ConverterNotFoundException: No converter
> found capable of converting from type [java.util.Arrays$ArrayList<?>] to type
> [java.lang.String]
> at
> org.springframework.core.convert.support.ConversionUtils.invokeConverter(ConversionUtils.java:42)
> ~[spring-core-4.3.3.RELEASE.jar:4.3.3.RELEASE]
> at
> org.springframework.core.convert.support.GenericConversionService.convert(GenericConversionService.java:192)
> ~[spring-core-4.3.3.RELEASE.jar:4.3.3.RELEASE]
> at
> org.springframework.core.convert.support.GenericConversionService.convert(GenericConversionService.java:176)
> ~[spring-core-4.3.3.RELEASE.jar:4.3.3.RELEASE]
> at
> org.apache.camel.spring.boot.SpringTypeConverter.convertTo(SpringTypeConverter.java:46)
> ~[camel-spring-boot-2.18.0.jar:2.18.0]
> at
> org.apache.camel.impl.converter.BaseTypeConverterRegistry.doConvertTo(BaseTypeConverterRegistry.java:346)
> ~[camel-core-2.18.0.jar:2.18.0]
> at
> org.apache.camel.impl.converter.BaseTypeConverterRegistry.convertTo(BaseTypeConverterRegistry.java:133)
> ~[camel-core-2.18.0.jar:2.18.0]
> ... 14 common frames omitted
> Caused by: org.springframework.core.convert.ConverterNotFoundException: No
> converter found capable of converting from type
> [java.util.Arrays$ArrayList<?>] to type [java.lang.String]
> at
> org.springframework.core.convert.support.GenericConversionService.handleConverterNotFound(GenericConversionService.java:313)
> ~[spring-core-4.3.3.RELEASE.jar:4.3.3.RELEASE]
> at
> org.springframework.core.convert.support.GenericConversionService.convert(GenericConversionService.java:195)
> ~[spring-core-4.3.3.RELEASE.jar:4.3.3.RELEASE]
> at
> org.springframework.core.convert.support.CollectionToStringConverter.convert(CollectionToStringConverter.java:68)
> ~[spring-core-4.3.3.RELEASE.jar:4.3.3.RELEASE]
> at
> org.springframework.core.convert.support.ConversionUtils.invokeConverter(ConversionUtils.java:36)
> ~[spring-core-4.3.3.RELEASE.jar:4.3.3.RELEASE]
> ... 19 common frames omitted
> {code}
> The root cause is spring failing to find a converter for Person --> String
> and as the SpringTypeConverter registered by camel-spring-boot is one of the
> fallback converters used by BaseTypeConverterRegistry, it leads Camel to fail
> too.
> As today is a Camel TypeConverter fails with an exception while looping over
> fallback converters, the loops ends and the conversion fails too. It may turn
> out that the bug is caused by the way camel uses Spring's type converters but
> it may be good to catch exceptions and try the next converter, [~davsclaus]
> make sense ?
> A workaround is to create a custom converter for the class:
> {code:java}
> @Component
> public class PersonConverter implements Converter<Person, String> {
> @Override
> public String convert(Person source) {
> return source.toString();
> }
> }
> {code}
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