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[jOOQ/jOOQ#12262] Delay initialisation of Jackson, Gson, JAXB classes in

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Convert
This commit is contained in:
Lukas Eder 2021-07-27 12:43:11 +02:00
parent bdeaf730c7
commit 17c65991e8
1 changed files with 84 additions and 73 deletions
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157
jOOQ/src/main/java/org/jooq/impl/Convert.java
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@ -148,26 +148,6 @@ final class Convert {
*/
private static final Pattern UUID_PATTERN = Pattern.compile("(\\p{XDigit}{8})-?(\\p{XDigit}{4})-?(\\p{XDigit}{4})-?(\\p{XDigit}{4})-?(\\p{XDigit}{12})");
/**
* The Jackson ObjectMapper or Gson instance, if available.
*/
private static final Object JSON_MAPPER;
/**
* The Jackson ObjectMapper::readValue or Gson::fromJson method, if available.
*/
private static final Method JSON_READ_METHOD;
/**
* The Jackson ObjectMapper::writeValueToString or Gson::toJson method, if available.
*/
private static final Method JSON_WRITE_METHOD;
/**
* Whether a JAXB implementation is available.
*/
private static final boolean JAXB_AVAILABLE;
static {
Set<String> trueValues = new HashSet<>();
Set<String> falseValues = new HashSet<>();
@ -204,62 +184,93 @@ final class Convert {
TRUE_VALUES = Collections.unmodifiableSet(trueValues);
FALSE_VALUES = Collections.unmodifiableSet(falseValues);
}
Object jsonMapper = null;
Method jsonReadMethod = null;
Method jsonWriteMethod = null;
boolean jaxbAvailable = false;
private static final class _JSON {
try {
Class<?> klass = Class.forName("com.fasterxml.jackson.databind.ObjectMapper");
/**
* The Jackson ObjectMapper or Gson instance, if available.
*/
private static final Object JSON_MAPPER;
/**
* The Jackson ObjectMapper::readValue or Gson::fromJson method, if available.
*/
private static final Method JSON_READ_METHOD;
/**
* The Jackson ObjectMapper::writeValueToString or Gson::toJson method, if available.
*/
private static final Method JSON_WRITE_METHOD;
static {
Object jsonMapper = null;
Method jsonReadMethod = null;
Method jsonWriteMethod = null;
try {
Class<?> kotlin = Class.forName("com.fasterxml.jackson.module.kotlin.ExtensionsKt");
jsonMapper = kotlin.getMethod("jacksonObjectMapper").invoke(kotlin);
log.debug("Jackson kotlin module is available");
Class<?> klass = Class.forName("com.fasterxml.jackson.databind.ObjectMapper");
try {
Class<?> kotlin = Class.forName("com.fasterxml.jackson.module.kotlin.ExtensionsKt");
jsonMapper = kotlin.getMethod("jacksonObjectMapper").invoke(kotlin);
log.debug("Jackson kotlin module is available");
}
catch (Exception e) {
jsonMapper = klass.getDeclaredConstructor().newInstance();
log.debug("Jackson kotlin module is not available");
}
jsonReadMethod = klass.getMethod("readValue", String.class, Class.class);
jsonWriteMethod = klass.getMethod("writeValueAsString", Object.class);
log.debug("Jackson is available");
}
catch (Exception e) {
jsonMapper = klass.getDeclaredConstructor().newInstance();
log.debug("Jackson kotlin module is not available");
catch (Exception e1) {
log.debug("Jackson not available", e1.getMessage());
try {
Class<?> klass = Class.forName("com.google.gson.Gson");
jsonMapper = klass.getDeclaredConstructor().newInstance();
jsonReadMethod = klass.getMethod("fromJson", String.class, Class.class);
jsonWriteMethod = klass.getMethod("toJson", Object.class);
log.debug("Gson is available");
}
catch (Exception e2) {
log.debug("Gson not available", e2.getMessage());
}
}
jsonReadMethod = klass.getMethod("readValue", String.class, Class.class);
jsonWriteMethod = klass.getMethod("writeValueAsString", Object.class);
log.debug("Jackson is available");
JSON_MAPPER = jsonMapper;
JSON_READ_METHOD = jsonReadMethod;
JSON_WRITE_METHOD = jsonWriteMethod;
}
catch (Exception e1) {
log.debug("Jackson not available", e1.getMessage());
}
private static final class _XML {
/**
* Whether a JAXB implementation is available.
*/
private static final boolean JAXB_AVAILABLE;
static {
boolean jaxbAvailable = false;
try {
Class<?> klass = Class.forName("com.google.gson.Gson");
jsonMapper = klass.getDeclaredConstructor().newInstance();
jsonReadMethod = klass.getMethod("fromJson", String.class, Class.class);
jsonWriteMethod = klass.getMethod("toJson", Object.class);
log.debug("Gson is available");
JAXB.marshal(new InformationSchema(), new StringWriter());
jaxbAvailable = true;
log.debug("JAXB is available");
}
catch (Exception e2) {
log.debug("Gson not available", e2.getMessage());
// [#10145] Depending on whether jOOQ is modularised or not, this can also
// be a NoClassDefFoundError.
catch (Throwable t) {
log.debug("JAXB not available", t.getMessage());
}
JAXB_AVAILABLE = jaxbAvailable;
}
JSON_MAPPER = jsonMapper;
JSON_READ_METHOD = jsonReadMethod;
JSON_WRITE_METHOD = jsonWriteMethod;
try {
JAXB.marshal(new InformationSchema(), new StringWriter());
jaxbAvailable = true;
log.debug("JAXB is available");
}
// [#10145] Depending on whether jOOQ is modularised or not, this can also
// be a NoClassDefFoundError.
catch (Throwable t) {
log.debug("JAXB not available", t.getMessage());
}
JAXB_AVAILABLE = jaxbAvailable;
}
/**
@ -1083,9 +1094,9 @@ final class Convert {
}
// [#10072] Out of the box Jackson JSON mapping support
else if (fromClass == JSON.class && JSON_MAPPER != null) {
else if (fromClass == JSON.class && _JSON.JSON_MAPPER != null) {
try {
return (U) JSON_READ_METHOD.invoke(JSON_MAPPER, ((JSON) from).data(), toClass);
return (U) _JSON.JSON_READ_METHOD.invoke(_JSON.JSON_MAPPER, ((JSON) from).data(), toClass);
}
catch (Exception e) {
throw new DataTypeException("Error while mapping JSON to POJO using Jackson", e);
@ -1093,9 +1104,9 @@ final class Convert {
}
// [#10072] Out of the box Jackson JSON mapping support
else if (fromClass == JSONB.class && JSON_MAPPER != null) {
else if (fromClass == JSONB.class && _JSON.JSON_MAPPER != null) {
try {
return (U) JSON_READ_METHOD.invoke(JSON_MAPPER, ((JSONB) from).data(), toClass);
return (U) _JSON.JSON_READ_METHOD.invoke(_JSON.JSON_MAPPER, ((JSONB) from).data(), toClass);
}
catch (Exception e) {
throw new DataTypeException("Error while mapping JSON to POJO using Jackson", e);
@ -1104,9 +1115,9 @@ final class Convert {
// [#11213] Workaround for a problem when Jackson or Gson do not know
// the generic List<X> type because toClass has its generics erased
else if (Map.class.isAssignableFrom(fromClass) && JSON_MAPPER != null) {
else if (Map.class.isAssignableFrom(fromClass) && _JSON.JSON_MAPPER != null) {
try {
return (U) JSON_READ_METHOD.invoke(JSON_MAPPER, JSON_WRITE_METHOD.invoke(JSON_MAPPER, from), toClass);
return (U) _JSON.JSON_READ_METHOD.invoke(_JSON.JSON_MAPPER, _JSON.JSON_WRITE_METHOD.invoke(_JSON.JSON_MAPPER, from), toClass);
}
catch (Exception e) {
throw new DataTypeException("Error while mapping JSON to POJO using Jackson", e);
@ -1114,7 +1125,7 @@ final class Convert {
}
// [#10072] Out of the box JAXB mapping support
else if (fromClass == XML.class && JAXB_AVAILABLE) {
else if (fromClass == XML.class && _XML.JAXB_AVAILABLE) {
try {
return JAXB.unmarshal(new StringReader(((XML) from).data()), toClass);
}
@ -1318,13 +1329,13 @@ final class Convert {
return UUID.fromString(UUID_PATTERN.matcher(string).replaceAll("$1-$2-$3-$4-$5"));
}
private static DataTypeException fail(Object from, Class<?> toClass) {
private static final DataTypeException fail(Object from, Class<?> toClass) {
String message = "Cannot convert from " + from + " (" + from.getClass() + ") to " + toClass;
// [#10072] [#11023] Some mappings may not have worked because of badly set up classpaths
if ((from instanceof JSON || from instanceof JSONB) && JSON_MAPPER == null)
if ((from instanceof JSON || from instanceof JSONB) && _JSON.JSON_MAPPER == null)
return new DataTypeException(message + ". Check your classpath to see if Jackson or Gson is available to jOOQ.");
else if (from instanceof XML && !JAXB_AVAILABLE)
else if (from instanceof XML && !_XML.JAXB_AVAILABLE)
return new DataTypeException(message + ". Check your classpath to see if JAXB is available to jOOQ.");
else
return new DataTypeException(message);