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class=breadcrumbs__link>Guide</span><li class=breadcrumbs__item><a class=breadcrumbs__link href=/docs/guide/rust/><span>Rust</span></a><li class="breadcrumbs__item breadcrumbs__item--active"><span class=breadcrumbs__link>Troubleshooting</span></ul></nav><span class="theme-doc-version-badge badge badge--secondary">Version: 1.3.0</span><div class="tocCollapsible_ETCw theme-doc-toc-mobile tocMobile_ITEo"><button type=button class="clean-btn tocCollapsibleButton_TO0P">On this page</button></div><div class="theme-doc-markdown markdown"><header><h1>Troubleshooting</h1></header><p>This page covers common issues and debugging techniques for Apache Fory™ Rust.</p> |
| <h2 class="anchor anchorTargetStickyNavbar_Vzrq" id=common-issues>Common Issues<a href=#common-issues class=hash-link aria-label="Direct link to Common Issues" title="Direct link to Common Issues" translate=no></a></h2> |
| <h3 class="anchor anchorTargetStickyNavbar_Vzrq" id=type-registry-errors>Type Registry Errors<a href=#type-registry-errors class=hash-link aria-label="Direct link to Type Registry Errors" title="Direct link to Type Registry Errors" translate=no></a></h3> |
| <p><strong>Error</strong>: <code>TypeId ... not found in type_info registry</code></p> |
| <p><strong>Cause</strong>: The type was never registered with the current <code>Fory</code> instance.</p> |
| <p><strong>Solution</strong>: Register the type before serialization:</p> |
| <div class="language-rust codeBlockContainer_Ckt0 theme-code-block" style=--prism-color:#393A34;--prism-background-color:#f6f8fa><div class=codeBlockContent_QJqH><pre tabindex=0 class="prism-code language-rust codeBlock_bY9V thin-scrollbar" style=color:#393A34;background-color:#f6f8fa><code class=codeBlockLines_e6Vv><div class=token-line style=color:#393A34><span class="token keyword" style=color:#00009f>let</span><span class="token plain"> </span><span class="token keyword" style=color:#00009f>mut</span><span class="token plain"> fory </span><span class="token operator" style=color:#393A34>=</span><span class="token plain"> </span><span class="token class-name">Fory</span><span class="token punctuation" style=color:#393A34>::</span><span class="token function" style=color:#d73a49>default</span><span class="token punctuation" style=color:#393A34>(</span><span class="token punctuation" style=color:#393A34>)</span><span class="token punctuation" style=color:#393A34>;</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain">fory</span><span class="token punctuation" style=color:#393A34>.</span><span class="token function" style=color:#d73a49>register</span><span class="token punctuation" style=color:#393A34>::</span><span class="token operator" style=color:#393A34><</span><span class="token class-name">MyStruct</span><span class="token operator" style=color:#393A34>></span><span class="token punctuation" style=color:#393A34>(</span><span class="token number" style=color:#36acaa>100</span><span class="token punctuation" style=color:#393A34>)</span><span class="token operator" style=color:#393A34>?</span><span class="token punctuation" style=color:#393A34>;</span><span class="token plain"> </span><span class="token comment" style=color:#999988;font-style:italic>// Register before use</span><br/></div></code></pre></div></div> |
| <p>Confirm that:</p> |
| <ul> |
| <li class="">Every serializable struct or trait implementation calls <code>fory.register::<T>(type_id)</code></li> |
| <li class="">The same IDs are reused on the deserialize side</li> |
| </ul> |
| <h3 class="anchor anchorTargetStickyNavbar_Vzrq" id=type-mismatch-errors>Type Mismatch Errors<a href=#type-mismatch-errors class=hash-link aria-label="Direct link to Type Mismatch Errors" title="Direct link to Type Mismatch Errors" translate=no></a></h3> |
| <p><strong>Cause</strong>: Field types are incompatible or schema has changed.</p> |
| <p><strong>Solution</strong>:</p> |
| <ul> |
| <li class="">Keep compatible mode enabled for schema evolution</li> |
| <li class="">Ensure field types match across versions</li> |
| </ul> |
| <div class="language-rust codeBlockContainer_Ckt0 theme-code-block" style=--prism-color:#393A34;--prism-background-color:#f6f8fa><div class=codeBlockContent_QJqH><pre tabindex=0 class="prism-code language-rust codeBlock_bY9V thin-scrollbar" style=color:#393A34;background-color:#f6f8fa><code class=codeBlockLines_e6Vv><div class=token-line style=color:#393A34><span class="token comment" style=color:#999988;font-style:italic>// Remove any compatible(false) override from the peers.</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token keyword" style=color:#00009f>let</span><span class="token plain"> fory </span><span class="token operator" style=color:#393A34>=</span><span class="token plain"> </span><span class="token class-name">Fory</span><span class="token punctuation" style=color:#393A34>::</span><span class="token function" style=color:#d73a49>builder</span><span class="token punctuation" style=color:#393A34>(</span><span class="token punctuation" style=color:#393A34>)</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> </span><span class="token comment" style=color:#999988;font-style:italic>// existing options</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> </span><span class="token punctuation" style=color:#393A34>.</span><span class="token function" style=color:#d73a49>build</span><span class="token punctuation" style=color:#393A34>(</span><span class="token punctuation" style=color:#393A34>)</span><span class="token punctuation" style=color:#393A34>;</span><br/></div></code></pre></div></div> |
| <h2 class="anchor anchorTargetStickyNavbar_Vzrq" id=debugging-techniques>Debugging Techniques<a href=#debugging-techniques class=hash-link aria-label="Direct link to Debugging Techniques" title="Direct link to Debugging Techniques" translate=no></a></h2> |
| <h3 class="anchor anchorTargetStickyNavbar_Vzrq" id=enable-panic-on-error-for-backtraces>Enable Panic on Error for Backtraces<a href=#enable-panic-on-error-for-backtraces class=hash-link aria-label="Direct link to Enable Panic on Error for Backtraces" title="Direct link to Enable Panic on Error for Backtraces" translate=no></a></h3> |
| <p>Toggle <code>FORY_PANIC_ON_ERROR=1</code> alongside <code>RUST_BACKTRACE=1</code> to panic at the exact site an error is constructed:</p> |
| <div class="language-bash codeBlockContainer_Ckt0 theme-code-block" style=--prism-color:#393A34;--prism-background-color:#f6f8fa><div class=codeBlockContent_QJqH><pre tabindex=0 class="prism-code language-bash codeBlock_bY9V thin-scrollbar" style=color:#393A34;background-color:#f6f8fa><code class=codeBlockLines_e6Vv><div class=token-line style=color:#393A34><span class="token assign-left variable" style=color:#36acaa>RUST_BACKTRACE</span><span class="token operator" style=color:#393A34>=</span><span class="token number" style=color:#36acaa>1</span><span class="token plain"> </span><span class="token assign-left variable" style=color:#36acaa>FORY_PANIC_ON_ERROR</span><span class="token operator" style=color:#393A34>=</span><span class="token number" style=color:#36acaa>1</span><span class="token plain"> </span><span class="token function" style=color:#d73a49>cargo</span><span class="token plain"> </span><span class="token builtin class-name">test</span><span class="token plain"> </span><span class="token parameter variable" style=color:#36acaa>--features</span><span class="token plain"> tests</span><br/></div></code></pre></div></div> |
| <p>Reset the variable afterwards to avoid aborting user-facing code paths.</p> |
| <h3 class="anchor anchorTargetStickyNavbar_Vzrq" id=struct-field-tracing>Struct Field Tracing<a href=#struct-field-tracing class=hash-link aria-label="Direct link to Struct Field Tracing" title="Direct link to Struct Field Tracing" translate=no></a></h3> |
| <p>Add the <code>#[fory(debug)]</code> attribute alongside <code>#[derive(ForyStruct)]</code> to emit hook invocations:</p> |
| <div class="language-rust codeBlockContainer_Ckt0 theme-code-block" style=--prism-color:#393A34;--prism-background-color:#f6f8fa><div class=codeBlockContent_QJqH><pre tabindex=0 class="prism-code language-rust codeBlock_bY9V thin-scrollbar" style=color:#393A34;background-color:#f6f8fa><code class=codeBlockLines_e6Vv><div class=token-line style=color:#393A34><span class="token attribute attr-name" style=color:#00a4db>#[derive(ForyStruct)]</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token attribute attr-name" style=color:#00a4db>#[fory(debug)]</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token keyword" style=color:#00009f>struct</span><span class="token plain"> </span><span class="token type-definition class-name">MyStruct</span><span class="token plain"> </span><span class="token punctuation" style=color:#393A34>{</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> field1</span><span class="token punctuation" style=color:#393A34>:</span><span class="token plain"> </span><span class="token keyword" style=color:#00009f>i32</span><span class="token punctuation" style=color:#393A34>,</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> field2</span><span class="token punctuation" style=color:#393A34>:</span><span class="token plain"> </span><span class="token class-name">String</span><span class="token punctuation" style=color:#393A34>,</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token punctuation" style=color:#393A34>}</span><br/></div></code></pre></div></div> |
| <p>Once compiled with debug hooks, call these functions to plug in custom callbacks:</p> |
| <ul> |
| <li class=""><code>set_before_write_field_func</code></li> |
| <li class=""><code>set_after_write_field_func</code></li> |
| <li class=""><code>set_before_read_field_func</code></li> |
| <li class=""><code>set_after_read_field_func</code></li> |
| </ul> |
| <p>Use <code>reset_struct_debug_hooks()</code> when you want the defaults back.</p> |
| <h3 class="anchor anchorTargetStickyNavbar_Vzrq" id=lightweight-logging>Lightweight Logging<a href=#lightweight-logging class=hash-link aria-label="Direct link to Lightweight Logging" title="Direct link to Lightweight Logging" translate=no></a></h3> |
| <p>Without custom hooks, enable <code>ENABLE_FORY_DEBUG_OUTPUT=1</code> to print field-level read/write events:</p> |
| <div class="language-bash codeBlockContainer_Ckt0 theme-code-block" style=--prism-color:#393A34;--prism-background-color:#f6f8fa><div class=codeBlockContent_QJqH><pre tabindex=0 class="prism-code language-bash codeBlock_bY9V thin-scrollbar" style=color:#393A34;background-color:#f6f8fa><code class=codeBlockLines_e6Vv><div class=token-line style=color:#393A34><span class="token assign-left variable" style=color:#36acaa>ENABLE_FORY_DEBUG_OUTPUT</span><span class="token operator" style=color:#393A34>=</span><span class="token number" style=color:#36acaa>1</span><span class="token plain"> </span><span class="token function" style=color:#d73a49>cargo</span><span class="token plain"> </span><span class="token builtin class-name">test</span><span class="token plain"> </span><span class="token parameter variable" style=color:#36acaa>--features</span><span class="token plain"> tests</span><br/></div></code></pre></div></div> |
| <p>This is especially useful when investigating alignment or cursor mismatches.</p> |
| <h3 class="anchor anchorTargetStickyNavbar_Vzrq" id=inspect-generated-code>Inspect Generated Code<a href=#inspect-generated-code class=hash-link aria-label="Direct link to Inspect Generated Code" title="Direct link to Inspect Generated Code" translate=no></a></h3> |
| <p>Use <code>cargo expand</code> to inspect code generated by Fory derive macros:</p> |
| <div class="language-bash codeBlockContainer_Ckt0 theme-code-block" style=--prism-color:#393A34;--prism-background-color:#f6f8fa><div class=codeBlockContent_QJqH><pre tabindex=0 class="prism-code language-bash codeBlock_bY9V thin-scrollbar" style=color:#393A34;background-color:#f6f8fa><code class=codeBlockLines_e6Vv><div class=token-line style=color:#393A34><span class="token function" style=color:#d73a49>cargo</span><span class="token plain"> </span><span class="token function" style=color:#d73a49>expand</span><span class="token plain"> </span><span class="token parameter variable" style=color:#36acaa>--test</span><span class="token plain"> mod </span><span class="token variable" style=color:#36acaa>$mod</span><span class="token plain">$::</span><span class="token variable" style=color:#36acaa>$file</span><span class="token plain">$ </span><span class="token operator" style=color:#393A34>></span><span class="token plain"> expanded.rs</span><br/></div></code></pre></div></div> |
| <h2 class="anchor anchorTargetStickyNavbar_Vzrq" id=running-tests>Running Tests<a href=#running-tests class=hash-link aria-label="Direct link to Running Tests" title="Direct link to Running Tests" translate=no></a></h2> |
| <h3 class="anchor anchorTargetStickyNavbar_Vzrq" id=run-all-tests>Run All Tests<a href=#run-all-tests class=hash-link aria-label="Direct link to Run All Tests" title="Direct link to Run All Tests" translate=no></a></h3> |
| <div class="language-bash codeBlockContainer_Ckt0 theme-code-block" style=--prism-color:#393A34;--prism-background-color:#f6f8fa><div class=codeBlockContent_QJqH><pre tabindex=0 class="prism-code language-bash codeBlock_bY9V thin-scrollbar" style=color:#393A34;background-color:#f6f8fa><code class=codeBlockLines_e6Vv><div class=token-line style=color:#393A34><span class="token function" style=color:#d73a49>cargo</span><span class="token plain"> </span><span class="token builtin class-name">test</span><span class="token plain"> </span><span class="token parameter variable" style=color:#36acaa>--features</span><span class="token plain"> tests</span><br/></div></code></pre></div></div> |
| <h3 class="anchor anchorTargetStickyNavbar_Vzrq" id=run-specific-test>Run Specific Test<a href=#run-specific-test class=hash-link aria-label="Direct link to Run Specific Test" title="Direct link to Run Specific Test" translate=no></a></h3> |
| <div class="language-bash codeBlockContainer_Ckt0 theme-code-block" style=--prism-color:#393A34;--prism-background-color:#f6f8fa><div class=codeBlockContent_QJqH><pre tabindex=0 class="prism-code language-bash codeBlock_bY9V thin-scrollbar" style=color:#393A34;background-color:#f6f8fa><code class=codeBlockLines_e6Vv><div class=token-line style=color:#393A34><span class="token function" style=color:#d73a49>cargo</span><span class="token plain"> </span><span class="token builtin class-name">test</span><span class="token plain"> </span><span class="token parameter variable" style=color:#36acaa>-p</span><span class="token plain"> tests </span><span class="token parameter variable" style=color:#36acaa>--test</span><span class="token plain"> </span><span class="token variable" style=color:#36acaa>$test_file</span><span class="token plain"> </span><span class="token variable" style=color:#36acaa>$test_method</span><br/></div></code></pre></div></div> |
| <h3 class="anchor anchorTargetStickyNavbar_Vzrq" id=run-test-with-debugging>Run Test with Debugging<a href=#run-test-with-debugging class=hash-link aria-label="Direct link to Run Test with Debugging" title="Direct link to Run Test with Debugging" translate=no></a></h3> |
| <div class="language-bash codeBlockContainer_Ckt0 theme-code-block" style=--prism-color:#393A34;--prism-background-color:#f6f8fa><div class=codeBlockContent_QJqH><pre tabindex=0 class="prism-code language-bash codeBlock_bY9V thin-scrollbar" style=color:#393A34;background-color:#f6f8fa><code class=codeBlockLines_e6Vv><div class=token-line style=color:#393A34><span class="token assign-left variable" style=color:#36acaa>RUST_BACKTRACE</span><span class="token operator" style=color:#393A34>=</span><span class="token number" style=color:#36acaa>1</span><span class="token plain"> </span><span class="token assign-left variable" style=color:#36acaa>FORY_PANIC_ON_ERROR</span><span class="token operator" style=color:#393A34>=</span><span class="token number" style=color:#36acaa>1</span><span class="token plain"> </span><span class="token assign-left variable" style=color:#36acaa>ENABLE_FORY_DEBUG_OUTPUT</span><span class="token operator" style=color:#393A34>=</span><span class="token number" style=color:#36acaa>1</span><span class="token plain"> </span><span class="token punctuation" style=color:#393A34>\</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> </span><span class="token function" style=color:#d73a49>cargo</span><span class="token plain"> </span><span class="token builtin class-name">test</span><span class="token plain"> </span><span class="token parameter variable" style=color:#36acaa>--test</span><span class="token plain"> mod </span><span class="token variable" style=color:#36acaa>$dir</span><span class="token plain">$::</span><span class="token variable" style=color:#36acaa>$test_file</span><span class="token plain">::</span><span class="token variable" style=color:#36acaa>$test_method</span><span class="token plain"> -- </span><span class="token parameter variable" style=color:#36acaa>--nocapture</span><br/></div></code></pre></div></div> |
| <h2 class="anchor anchorTargetStickyNavbar_Vzrq" id=test-time-hygiene>Test-Time Hygiene<a href=#test-time-hygiene class=hash-link aria-label="Direct link to Test-Time Hygiene" title="Direct link to Test-Time Hygiene" translate=no></a></h2> |
| <p>Some integration tests expect <code>FORY_PANIC_ON_ERROR</code> to remain unset. Export it only for focused debugging sessions:</p> |
| <div class="language-bash codeBlockContainer_Ckt0 theme-code-block" style=--prism-color:#393A34;--prism-background-color:#f6f8fa><div class=codeBlockContent_QJqH><pre tabindex=0 class="prism-code language-bash codeBlock_bY9V thin-scrollbar" style=color:#393A34;background-color:#f6f8fa><code class=codeBlockLines_e6Vv><div class=token-line style=color:#393A34><span class="token comment" style=color:#999988;font-style:italic># For specific debugging only</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token assign-left variable" style=color:#36acaa>FORY_PANIC_ON_ERROR</span><span class="token operator" style=color:#393A34>=</span><span class="token number" style=color:#36acaa>1</span><span class="token plain"> </span><span class="token function" style=color:#d73a49>cargo</span><span class="token plain"> </span><span class="token builtin class-name">test</span><span class="token plain"> </span><span class="token parameter variable" style=color:#36acaa>-p</span><span class="token plain"> tests </span><span class="token parameter variable" style=color:#36acaa>--test</span><span class="token plain"> specific_test -- </span><span class="token parameter variable" style=color:#36acaa>--nocapture</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain" style=display:inline-block></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token comment" style=color:#999988;font-style:italic># Normal test run (without panic on error)</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token function" style=color:#d73a49>cargo</span><span class="token plain"> </span><span class="token builtin class-name">test</span><span class="token plain"> </span><span class="token parameter variable" style=color:#36acaa>--features</span><span class="token plain"> tests</span><br/></div></code></pre></div></div> |
| <h2 class="anchor anchorTargetStickyNavbar_Vzrq" id=error-handling-best-practices>Error Handling Best Practices<a href=#error-handling-best-practices class=hash-link aria-label="Direct link to Error Handling Best Practices" title="Direct link to Error Handling Best Practices" translate=no></a></h2> |
| <p>Prefer the static constructors on the facade <code>Error</code> type:</p> |
| <ul> |
| <li class=""><code>Error::type_mismatch</code></li> |
| <li class=""><code>Error::invalid_data</code></li> |
| <li class=""><code>Error::unknown</code></li> |
| </ul> |
| <p>This keeps diagnostics consistent and makes opt-in panics work correctly.</p> |
| <h2 class="anchor anchorTargetStickyNavbar_Vzrq" id=quick-reference>Quick Reference<a href=#quick-reference class=hash-link aria-label="Direct link to Quick Reference" title="Direct link to Quick Reference" translate=no></a></h2> |
| <table><thead><tr><th>Environment Variable<th>Purpose<tbody><tr><td><code>RUST_BACKTRACE=1</code><td>Enable stack traces<tr><td><code>FORY_PANIC_ON_ERROR=1</code><td>Panic at error site for debugging<tr><td><code>ENABLE_FORY_DEBUG_OUTPUT=1</code><td>Print field-level read/write events</table> |
| <h2 class="anchor anchorTargetStickyNavbar_Vzrq" id=related-topics>Related Topics<a href=#related-topics class=hash-link aria-label="Direct link to Related Topics" title="Direct link to Related Topics" translate=no></a></h2> |
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| <li class=""><a class="" href=/docs/guide/rust/configuration>Configuration</a> - Fory options</li> |
| <li class=""><a class="" href=/docs/guide/rust/type_registration>Type Registration</a> - Registration best practices</li> |
| <li class=""><a class="" href=/docs/guide/rust/schema_evolution>Schema Evolution</a> - Compatible mode</li> |
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