Conversion failed exception from String to bson ObjectId on Mongo calls

[Kramani99]

Hi,
We are getting following error logged in Dynatrace on all Mongo calls even though app functions normally and we are also unable to see the exception when debugging through IDE:
Exception:
org.springframework.core.convert.ConversionFailedException
Message:
Failed to convert from type [java.lang.String] to type [org.bson.types.ObjectId] for value ''; nested exception is java.lang.IllegalArgumentException: invalid hexadecimal representation of an ObjectId: []
Stacktrace:
org.springframework.core.convert.support.ConversionUtils.invokeConverter(ConversionUtils.java:47)
org.springframework.core.convert.support.GenericConversionService.convert(GenericConversionService.java:191)
org.springframework.core.convert.support.GenericConversionService.convert(GenericConversionService.java:174)
org.springframework.data.mongodb.core.convert.MongoConverter.convertId(MongoConverter.java:146)
org.springframework.data.mongodb.core.convert.QueryMapper.convertId(QueryMapper.java:636)
org.springframework.data.mongodb.core.convert.QueryMapper.getMappedValue(QueryMapper.java:384)
org.springframework.data.mongodb.core.convert.QueryMapper.getMappedObjectForField(QueryMapper.java:243)
org.springframework.data.mongodb.core.convert.QueryMapper.getMappedObject(QueryMapper.java:152)
org.springframework.data.mongodb.core.convert.QueryMapper.getMappedKeyword(QueryMapper.java:285)
org.springframework.data.mongodb.core.convert.QueryMapper.getMappedObject(QueryMapper.java:124)
org.springframework.data.mongodb.core.MongoTemplate.doFindOne(MongoTemplate.java:2473)
org.springframework.data.mongodb.core.MongoTemplate.findOne(MongoTemplate.java:820)
org.springframework.data.mongodb.core.MongoTemplate.findOne(MongoTemplate.java:807)
org.springframework.data.mongodb.core.MongoTemplate$$FastClassBySpringCGLIB$$5a5a6b8.invoke()
org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:218)
org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.invokeJoinpoint(CglibAopProxy.java:769)
org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:163)
org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.proceed(CglibAopProxy.java:747)
org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:93)
org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186)
org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.proceed(CglibAopProxy.java:747)
org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:689)
com.company.config.MongoTemplateWithMetrics$$EnhancerBySpringCGLIB$$.findOne
com.company.dao.connect.AppointmentDAOConnect.findByParameterAppointment(AppointmentDAOConnect.java:689)
com.company.dao.connect.AppointmentDAOConnect$$FastClassBySpringCGLIB$$40444430.invoke()
org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:218)
org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.invokeJoinpoint(CglibAopProxy.java:769)
org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:163)
org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.proceed(CglibAopProxy.java:747)
org.springframework.dao.support.PersistenceExceptionTranslationInterceptor.invoke(PersistenceExceptionTranslationInterceptor.java:139)
org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186)
org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.proceed(CglibAopProxy.java:747)
org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:689)
com.company.dao.connect.AppointmentDAOConnect$$EnhancerBySpringCGLIB$$.findByParameterAppointment

How can I go about debugging the issue?

[christophstrobl]

Which version of data-mongodb are you using? There's a guard in the conversion to check validity of a given String representation via ObjectId.isValid.
A complete minimal sample (something that we can unzip or git clone, build, and deploy) that reproduces the problem would help spot the issue.

[Kramani99]

We are using spring boot mongo 2.2.0. Is this a known issue or should I go ahead and create a sample project?