revert convert Object->String, causes NPE problems

src/main/java/net/hostsharing/hsadminng/config/JsonObjectMapperConfiguration.java

@@ -3,7 +3,6 @@ package net.hostsharing.hsadminng.config;
 import com.fasterxml.jackson.core.JsonParser;
 import com.fasterxml.jackson.databind.DeserializationFeature;
 import com.fasterxml.jackson.databind.SerializationFeature;
-import com.fasterxml.jackson.databind.module.SimpleModule;
 import com.fasterxml.jackson.datatype.jsr310.JavaTimeModule;
 import org.openapitools.jackson.nullable.JsonNullableModule;
 import org.springframework.context.annotation.Bean;
@@ -11,7 +10,6 @@ import org.springframework.context.annotation.Configuration;
 import org.springframework.context.annotation.Primary;
 import org.springframework.http.converter.json.Jackson2ObjectMapperBuilder;
 
-import java.math.BigDecimal;
 
 @Configuration
 public class JsonObjectMapperConfiguration {

src/test/java/net/hostsharing/hsadminng/hs/office/coopassets/HsOfficeCoopAssetsTransactionRepositoryIntegrationTest.java

@@ -69,7 +69,7 @@ class HsOfficeCoopAssetsTransactionRepositoryIntegrationTest extends ContextBase
                 final var newCoopAssetsTransaction = HsOfficeCoopAssetsTransactionEntity.builder()
                         .membership(givenMembership)
                         .transactionType(HsOfficeCoopAssetsTransactionType.DEPOSIT)
-                        .assetValue(new BigDecimal("6,400.00"))
+                        .assetValue(new BigDecimal("6400.00"))
                         .valueDate(LocalDate.parse("2022-10-18"))
                         .reference("temp ref A")
                         .build();

src/test/java/net/hostsharing/hsadminng/hs/office/scenarios/TemplateResolver.java

@@ -59,7 +59,7 @@ public class TemplateResolver {
             return Arrays.stream(values()).filter(p -> p.prefixChar == givenChar).findFirst().orElseThrow();
         }
 
-        abstract String convert(final Object value, final Resolver resolver); // FIXME: why Object and not String?
+        abstract String convert(final Object value, final Resolver resolver);
     }
 
     private final static Pattern pattern = Pattern.compile(",(\\s*})", Pattern.MULTILINE);